There are a lot of people that say drinking helps them be a better musician/DJ. Unfortunately, this is rarely the case.
I remember a few times in college, back when I was trying to be a “real” musician (professional trumpet player), being at a few gigs where the people around me were getting hammered while I was staying sober. They thought that they sounded like the next Miles Davis, while I knew that they were sounding progressively worse and worse the more shots they took.
I see it also with local bands. You can tell how good and professional a band is going to be based on the amount of liquor they consume before and during the show. Believe it or not, the best bands are the ones that don’t have a bar tab that needs comping at the end of the night (btw, if you need to drink, make sure you put it in your contract. We have one band that puts a case of coors light and a case of water in their rider, and that takes care of them for the whole night.)
I don’t have more than 1 or 2 drinks when I DJ at a mobile gig. I don’t drink at all at the bar I DJ at. I feel that DJing is getting what you hear in your head out to the audience. If I have a substance messing with my head, that becomes close to impossible.
I used to drink a ton of energy drinks/soda at gigs, and I had to stop doing it. I was staying up till all hours of the night on a caffeine high, and that wasn’t good at all.
For me, it was a hand-to-mouth thing. I found that if I had a bottle of water or tea with me, I’d reach for that instead of an energy drink. It was gradual, though. I went from redbull, to soda, to fruit juice, to water/tea. I’ve found that being gradual is the best way to make a lasting change, instead of going cold turkey.
Good luck. I’ve been around the bar business a long time, and I know how hard it is to kick the habit. Definitely don’t be afraid to get professional help if you can’t do it on your own.