Please help..

I had a baby back in July. A few weeks later I got an IUD. After insertion I bled for 4 months straight, no days off. I decided to remove it and then shortly after had a period in March. Meanwhile I met with a bariatric Doc at the end of March and started phentermine. Ever sense then I have not had a period until this week. To trigger this period i took 10 days of progesterone. 2 days after finishing progesterone I went to the ER with sever stomach pain. 5 or so days later I got my period and now I’m on day 9 of this period. My OBGYN started me on birth control a week and a half ago to manage my hormones and ever sense then I have been nauseous every. Single. Day. After I eat. My stomach feels sick and queasy every day as well. The hot flashes are insane and towards the end of the day I get really really bad hunger pains. About a month ago I started on metformin for my insulin resistance as well. I’m not really sure where to go from here, but I feel like my body is failing me, and I’m miserable EVER SINGLE DAY. I’m slipping into a depression bc I want to feel normal.