I may not be overweight but I do have a similar problem that I felt I should tell someone about. This happened yesterday. I was diagnosed with bursitis recently and was prescribed an anti-inflammatory for it. It helped with the pain but I gained at least 5 lbs. of water weight. I look like a granny smith apple on a toothpick and it is extremely uncomfortable. I had evidence that it wasn’t fat but guess what he told me. He called me fat, a pig, and then said I should join weightwatchers!
I also had been mistreated by my previous doctor because I was on low levels of antidepressants. Not because I was depressed but because of the fibromyalgia. I have what is now a mild case but I could never sleep because of low serotonin levels associated with this condition. Low doses of a certain antidepressant raised my levels enough to sleep again. Unfortunately, my other previous doctor never informed me that it was in fact an antidepressant. Ever since then my doctors after that have completely ignored evrything I have ever said. Because of that it took several years to be diagnosed with celiac sprue, a very complicated and misdiagnosed allergy.