So long, Diet Coke

Hi.  My name is Chrissy.  I'm a Diet Coke-aholic.  And I'm ready to change.
I've never considered myself to be on the crazy spectrum of Diet Coke drinking. I usually have 1 can a day, occasionally 2 (I'm sure that's crazy by someone's standards, but I try to keep it somewhat limited).  And I've tried to justified my DC drinking by thinking it could be worse.  I mean, it's not like I'm smoking or getting drunk, right?  Seth has always argued that this way of thinking isn't logical, that I'm still putting something harmful into my body, and deep down I've always known he's right.  But it's an addiction. Plain and simple.
I've been going back and forth about breaking this addiction for some time now.  But as alcoholics enjoy drinking alcohol, I enjoy drinking Diet Coke.  I look forward to eating lunch every day knowing that my precious DC is waiting for me, all nice and cold and bubbly.  I work hard as a stay-at-home mom, and a small business owner, so don't I deserve it?  Um, hello! As scary as that thought sounds, it's the thought that goes through my head every day as I'm pouring myself a fizzing glass.  I mean, COME ON!  I can't think of other, healthier things that I deserve??  Like not getting cancer or developing other serious health problems from the aspartame?  Or osteoporosis from the phosphoric acid leaching the calcium from my bones?
The thing that really freaks me out is when I drink it even when I don't want it.  It's like my body craves it and my brain can't do anything about it.  Even when I'm sick and have a taste for no food at all, I'll find myself drinking a Diet Coke just because.  Healthy, huh?
The thing that solidified my desire to change was a particularly insane DC drinking day yesterday, when I had a large Diet Coke from McDonald's with lunch (yes, LARGE. That's 32 ounces, people!!), then a can-and-a-half with dinner.  I felt out of control.  Because I AM out of control.
Maybe I'm being over-dramatic about this, but I don't care.  I don't want to be a slave to something this stupid any longer.  Life is just too dang short.  So here's the deal, I've tried to kick this habit before, but I've been all "I'll only have some when we go out to eat" or "Only on holidays", which inevitably turns into drinking it again full-time.  So this time, it's over.  I'm breaking up with you, Diet Coke.  For good.  The end.  So help me God.  (Seriously, God, please help me. I'm going to need it.)
Now, which way to the support group?