Hi ShirleyLouise,
As Dee says, it's hard to see what you could be getting out of this relationship. Your boyfriend clearly has a problem. That urinary tract excuse has to be the best example of denial I've seen. Unbelievable he thinks drinking 24 cans of beer makes more sense than seeing a doctor about that problem.
If your boyfriend is convinced he doesn't have a problem, and his drinking is making your life as miserable as it sounds, then it's hard to see how your current situation could get any better. Things must have been good once for you to be living together, so I understand why leaving would be a painful decision, but it sounds like you already know what the best option is.
Whatever you decide to do, I hope you find the happiness that you deserve.