I give you a lot of credit for asking for help.
I drank horribly through college (at a might less prestigious university than you), law school and grad school.
I did terribly in college, but I performed fairly well in my post-grad efforts, even though I got drunk every night.
It sure sounds like you need help.
I would go to a psychiatrist and let him or her make and assessment and point you in the direction of further help.
Please stay around here, my friend, we like you already.