A.E.
Every stay at home mom I know of goes through this, so don't worry. Your doctor can help & I think if you just repeat the above they will understand and be able to help. I hate taking pills, so if you do as well you may try a few of these tips to help.
Make lists of what you need to do & put it in order of what must get done first. Set a daily schedule for yourself & your baby, and try and stick to it as much as possible. GET OUT OF THE HOUSE! I really enjoy a Stay at Home Mom's playgroup my girls & I are in, and you can find one close to you on google or at meetup.com. Also, I am member of a gym & that is the best thing I ever did. I don't go like I should, but when I am going regularly I have so much energy and get some much needed 'me' time. If you keep busy during the day your more likely to tire-yourself out for good sleeping at night. Talk to your husband or signif. other about this as well. Explain how you feel and that you need a night out once in a while to do more than grocery shop.
Okay, those are my tips and the things that have helped me & several SAHMs that I know. Try the above and/or talk to your doctor. Remember that taking care of yourself IS taking care of your family!