Hi C.,
Congratulations! It's wonderful that you were able to spend so much time with your wonderful boy for his first 8 months. First, do NOT beat yourself up about not being able to keep up with everything. Nobody can. The secret, for those who either can't afford to hire someone or don't want to for other reasons, is to acknowledge that you're not going to be able to do it all and figure out what you're willing to let go of and let slide a little.
For instance, if having a home cooked meal every night is not a top priority for you, there are a number of services out there that are not that expensive that will deliver as many meals a week as you want or you can pick up pre-cooked/made meals at a lot of the grocery stores. Another trick is to learn how to use and then actually use a crock pot. You can do a lot of great meals with a crock pot and it doesn't take a lot of prep time and everything is ready when you get home in the evening! Also remember that even if you are cooking for your family every night, it doesn't have to be a gourmet meal. Keep it simple.
As for cleaning, are you okay with not vaccuming every day? Does everything have to be put just so? If not, then relax about the cleaning. But, you can get some cute "baskets" and boxes of all sorts at The Container Store for neatly storing toys, mail, clothes, baby items, almost anything. If you spend just 10-15 minutes a day straightening up or cleaning, then you actually get a lot done and go a long way towards keeping your house neat and clean without having to spend a lot of time.
Try to exercise with your baby - get a jogging stroller and go for a jog with him. Do floor exercises with him -- he can lay on the floor looking up at you while you do push ups and make a game out of it. You can also lay on your back and hold him around his sides as you lift him up until your arms are straight and lower him down and repeat - again, make a game of it. Use him as your weights for doing lunges, crunches, and any number of exercises. Alternatively, get up early in the morning and do your workout before everyone else gets up - I am at the gym when it opens at 5:30 and do 30 minutes of cardio M,W,& F and then I do my own one hour workout on Tuesdays and an hour Pilates class on Thursdays. You can also go in the evenings after dinner and after your son is in bed, assuming he goes to bed around 7/7:30.
One final thought - what else can your husband do that he isn't doing now? Maybe your husband already does a lot to help out both in caring for the baby and keeping the house in order, but most do not. If he falls into the latter category, push him to help. So it doesn't sound like nagging, try saying, "Hon, if you help me clean the kitchen, it will be done in half the time and we can spend more time together doing something fun with each other and with our son. Plus, we'll be spending time together while we're cleaning the kitchen!" Or something like that.
Good luck. You'll be fine. Just relax and really think about what you're willing to live with in terms of what needs to get done versus what would be nice to be able to get done around the house.
N.