I agree with AniManiac. Talk to your family doctor about your appetite and weight loss. Hopefully he/she can suggest something to help you gain back some weight. If you don't want to stop the stimulants, there are some medications that can be given to stimulate appetite and help you gain weight. I like the idea of the Tamagotchi! I remember when those came out. My girls loved them.

Also make sure you let the prescriber of your stimulants know what is going on. Weight loss is a side effect they should be informed about.