I'm afraid it is a disease.
For those who don't know about Alcoholism; here's the wiki: http://en.wikipedia.org/wiki/Alcoholism. I'm pretty sure other sources will say the same.
Medical institutes indeed call it a disease; as once you finally came away from it; you can NEVER touch alcohol again; else you will revert back to being to how you were. You brain becomes dependant on the chemicals, thus this is not a condition as you are not born with it; nor is it hereditary.
Getting sucked into your own hype should also be a disease :-/ That can do things to your brain aswell; asuming you have one to start with.