I've run a few marathons with a hangover. They're much more enjoyable sober!
It sounds like you have a problem and should look at quitting. I know that for you it might seem like a very drastic decision. But you say yourself it is getting worse. You're having black outs- how do you really know you haven't driven if you don't have any memory? And, you're shocked at the amount you drink.
Keep reading here and posting. Welcome to SR. Even if you decide you aren't an alcoholic - and I hope you are not - you will learn something.