Does anyone out there have an addiction to diet soda?

I think I’m addicted to diet Mountain Dew. Perhaps addiction is too strong a word, but I honestly have cravings for the damn stuff and become very grumpy when I don’t have at least one per day. I also feel that it adds to other unhealthy cravings—for sweets in particular. It is almost as if the sweetness of the drink makes my body expect calories.
I’m determined to break the “addiction.” So, if there is anyone out there who has any advice, I’d appreciate it.