curtis,
u need to becareful with these diet drinks which contain aspartame. aspartame may be causing your cravings. It may be 'diet' but it's just not good for you. You should be drinking alot of water and instead of aspartame use stevia, splenda... however not many products have these sweeteners ready-made.
Here's an eye-opening FAQ on aspatame and it's toxic side-effects http://www.holisticmed.com/aspartame/suffer.faq