Was the weight loss the only reason you stopped the meds or were there other reasons (it didn't work, too expensive, etc)? Each medication has side effects but there are ways to deal with them, your doctor might adjust the dosage, switch you to another (a nonstimulant that wouldn't cause appetite supression for example), or add one to compensate the issues.

A nutritionnist can also assist if the main difficulty is eating related. What kind of help would you like to have? If you are a student, accommodations might be useful as well. If you're looking for the therapy route, maybe your GP/psychiatrist can recommend someone too.