I've gained ~20lbs w/in a month w/o change to diet/exercise. thyroid panel wnl. i'd taken 100mg dhea short term for weight loss. could this have caused this? besides diet & exercise, anything to help?

Many questions: If the dhea is the only change, it may be, but by stopping it and continuing on your journey, you should return to normal, unless, there is a fluid retention issue from diet, medicine, or renal or heart issues that at times can cause those issues. Where does the weight seem to added? Stomach? Ankles? If you are having a lot of ankle or leg swelling, you should have it checked out by your md.

Unusual: Defying physics is remarkable. You have created energy without a source. Most people cannot possibly gain weight without a change in diet or exercise. You need to sit down and think about this, and then formulate a plan so that you expend more calories than you consume. Good luck and have a great weekend.