H.B.
Hormones, Hormones, Hormones... I agree. This sounds like some sort of an imbalance. Also, don't stop until you get someone to listen to you.
After I had my daughter, I was having trouble with a host of different things including my weight, sleep issues etc and I was told that it was post partum for nearly 1 year.
Finally after refusing that response (I knew better) I got them to run more extensive blood tests and found that my hormones were completely off and I was suffering from an Auto-Immune disorder.
Good Luck!