I started having peri-menopausal symptoms at 38, so it could be that. However, I would get it checked out - make a Dr. appt. just to be sure. When did your mother start menopause, that will be a good indicator of when you can start it. My mother went through it in her early to late 30's.
I see that you are a very ambitious young mom - homeschooling four kids. That's great. I did that for awhile when my kids were young. I hope you remember (I didn't too much) to take time out for yourself and do fun things with your friends without the kids at times.
Take care,
K.