Battle of losing weight and diet pills

Over the past few years my periods have become extremely bad. My hormones are out of control and birth control makes me sick. My periods are so heavy I suffer from anemia and at least a week before my period I have horrible pms and have no energy. Im so drained, I cant workout and have gained over 50+ lbs in 2 years. I was already 20 lbs overweight so now I’m 70 lbs overweight of which is making my hormones worse and I am depressed now. My doctor and I have talked about me taking phentermine to help me with weight loss and give me the extra push to achieve a healthy weight of which will help with hormonal issues. I’m on the fence about it but I am starting to lean in the direction of taking it because Im desperate to feel better. I was wondering if anyone else has taken phentermine and if it worked for you?