I agree with everyone else form a plan and stop. My downfall was beer and pizza too, loved em both. Fortunately you don't have to give up the pizza! But do please give up the beer.
I know how it is, the cold anxiety relief provided in a can. But the aftermath is horrible. Think about how much it affects us if we can't simply just stop drinking this liquid!
I quit by just taking it one day at a time, start today, don't worry about drinking tomorrow until tomorrow happens. Focus on not drinking and just going to sleep, do that each day and soon enough you'll have weeks, then months, then years etc. Its tough but it can be done!