I only got halfway through.
Run, do not walk, to the nearest exit, and never look back.
Adult ADD is hard to diagnose. Adderall may not be prescribed in Thailand, but Ritalin is, under the trade name Rubifen.
Excessive amphetamine usage could cause loss of weight, but medications for ADD shouldn't cause that much weight loss. And the dehydration is suspect of other causes. If you had diarrhea as well, suspect other causes.
PM me if you wish, but while you're running out the door, please.