Mom, I'm so sorry. You are at a tipping point here and it is probably impossible right now for you to see any light at the end of the tunnel. But there is some, I promise. You just have to get through this.
I urge you to go back to your earlier question about what happens if a spouse runs off with all the money. I think that it was Riley who wrote a sobering answer that talked about her friend whose husband made over 100 grand a year and has left his non-working spouse destitute, demanded child AND spousal support (hopefully he didn't get spousal support), and he got custody of the kids because she couldn't support them. Maybe right now, the thought of hubby getting stuck with 2 kids is a welcome one, but you will NEVER get your PhD if you are paying him child support. You'll be living in a shoebox while he takes most of your paycheck to hire someone to watch the kids.
The worst part is that the boys will be SO hurt that you left them, that when you are feeling better, they will not want to see you. My mother went through this as a child because her mother left her husband and 3 kids. The kids were 3, 5, and 7 when she left. (My mom was 5.) Granddad died when my mom was 13, and it wasn't until my mom was married with kids that she had a relationship with Grandma again. My mom is a very kind woman and gave her mother a chance, Sunni. The older brother didn't speak to his mother until a few months before he dropped dead of a heart attack at 45 years old. The younger one had tenuous and very sporatic contact. All of the kids were damaged and devastated over their mother's actions. For life, Sunni.
For all intents and purposes, my mom ended up being all that grandma had. We didn't live close by, we didn't visit too often. My mom did forgive her for what she did. Because of this, she had us as grandchildren. The grandkids from my uncle who died didn't even find out that their grandmother (whom they had never seen) had died for 10 years afterwards because their mother refused to tell them.
Grandma lived til she was in her 70's, and Sunni, she had to live with the fact that she walked out on her children for the rest of her life, and it was a long and HARD life. She thought she would be happy away from a family she didn't want and a husband who worked too hard and was tired at the end of the day and preoccupied with taking care of his family, including his mother and ill sister. (He was 20 years older than my grandmother.) But truthfully, nothing made her happy and she ended up pretty miserable. I'm very glad that my mother made peace with her - my mom needed it, and for sure, my grandmother needed it. (Not that grandma deserved it, mind you.)
I know this is an awful story and it probably doesn't feel good to you to hear it. I'm not trying to beat you up with it either. On the contrary. It reminds me a little of the story "It's A Wonderful Life". My grandmother didn't get to see what life would have been like if she had never been born, but she did see what life ended up like because she removed herself from her children's lives. It wasn't a happy one. I don't believe yours will be either, and that's why I am telling it to you. Learning from other people's mistakes is a gift. There are some people who never learn from other's mistakes and are doomed to only learn from their own.
Your teenager will leave home in a few short years. Then it will be just the younger one left. Please just go ahead and find a job and work. Hire someone to come clean the house in the late afternoons to be there for your kids after school until you get home from work. Even if she ends up with most of what you make, you will feel better about your life and have real people to talk to, the house will be clean, and you'll spend less time fighting with your teenager. You'll be getting the experience you need in the work place and if you decide in a few years when it's just the younger one at home that you want to get a divorce, it will be easier because you can get custody and NOT have to pay HIM child support, because you will have a paying job.
I'm sorry about your mother. Nothing you do will fix her aging problem. Of course it's an added stressor - most of us with aging parents feel this keenly.
If you haven't talked to your doctor yet, you should. If you really feel that you are drowning, you need the doctor's help. Stop worrying about your husband right now. Don't pay attention if he fusses that what you do isn't enough. Don't discuss it with him either. Get the doctor to help you so that you can feel stronger. Try to remember that your children really do love you - they are just children and they don't mean to dismiss you so much.
Please do what the people on your other thread recommend. Get your documents ducks in a row. Know where all the assets are, and all the money. Have your own bank account open and fund it. Before you can "find yourself", you need to get your act together and have who you are as a fiscal couple sorted out and ready in case your husband decides to leave.
Lastly, I want to tell you that when my grandmother left my grandfather, she had run up bills all over town without him knowing it. Not on stuff for the kids. On stuff for her. Stuff she took away with her. He owed so much money on her bills that he didn't get them paid off until the year before he died - 7 years worth. I would hate for that to happen to you if your husband walked away with all the bank account money and left you circling the toilet financially.
Please get to the doctor, get started on safeguarding yourself financially, get back into your profession, hire help after school that includes cleaning the house, and work on feeling better about life, at least until you get your teenager out of your house after he graduates. (No allowing him to live at home after graduation.) If you feel better, you can handle your 6 year old better. (Time out in the 6 year old's room for back talk is what you need right now, every single time. He can come out of his room when he apologizes to you for ugly talk. It will be a break for you and for him and give you both a chance to break the cycle of fighting.)
Hugs and hopes that you can get through this okay.
Dawn