Struggling

I have many health issues and am trying to recover from anorexia and bulimia.

I was just informed by one of my specialists that I need to lie between 35-40 pounds. I am not sure how to even start this process. I know exercise is going to be a challenge due to my fibromyalgia and DJD (degenerative joint disease). I struggle with eating presently because I have idiopathic Hypersomnia and am being treated with stimulants (enough for a 900 pound man) which make me never hungry.

In the past few months, I was eating maybe 1 meal that my husband would cook for dinner. I know that is not good. Are there any suggestions that you can give me to help me drop weight and make my doctor happy?