Hi Nirmal,
I balooned up from bipolar meds. I then couldn't take it anymore, so I went off Lithium and swithched to Topamax. I lost alot of weight, I even took it to an extreme for a while. Doc told me at one point to stop it because I was becoming anorexic. I think that was on my own devise, though, not the pills. And it is a great mood stabilizer for me.
Some people don't like Topamax, for it can leave you at a loss for words and other things. You get over it though. I deal with the forgetrfulness as long as I can be thin.
I don't think Ritilin is a good idea, as you know it probably isn't the best choice for you. I asked my pdoc for Adderall the other day. I wanted alot of energy to do things. She told me no. I knew she would. It would be a bad idea and I know I'd become addicted to them and abuse them.
With Topamax, I lost 90 pounds. I now gained some back . I was too thin at one point.