I need medication to speed my body and metabolism up daily for the rest of my life and all i can say is dont do it. Its really not worth the self harm. You cant get my tablets over the counter and if you want you could go and talk to the doctors about the medication to help a diet that they usually give to some people but only if they think you need it. All honesty medications shit. If you need it your stuck with it. they make me ill as well as being addictive. One thing i learned from all this is how much happyer my life was when i was taking 0 medication at all.
There are foods which help increase metabolic rates and natural fat burners, there will be some info on the net if you type it in, as well as some cardio and other such things.
I think the metabolic booster foods would be much better for you than diet pills. Top it off with a bit of cardio some time a week and see how much of a diffrents it makes than popping pills because really You think that this eating disorder stuff is all a really great way of dropping pounds until you get really ill. then you wish you never knew this life.