I have no idea if it is depression or not we can't diagnose things on here as it could lead to trouble. Please like Suzi and Mike said the best person to tell you is the Doctor. Alcohol is not going to help the situation i do know that. There are a couple of triggers that you might pot like for instance.
Have you stopped doing the things you used to like doing?
Is your personal hygiene ok?
As I said I can't tell if it is depression but I should check it out.