((Rain))) I agree with everyone else see your Dr first. Here is a link to it
http://www.drugs.com/sfx/amphetamine...e-effects.html

another one to how addictive they can be
http://www.drug-addiction.com/amphetamine_addiction.htm

Talk to your Dr if you can , he maybe able to help you see a dietician who can help you with eating correctly to help lose weight