I think you need to quit, not just cut back. You are an alcoholic, honey. I'm sorry to have to say it, but it's true. If you can't quit for even one week, there is a problem there. Alcoholics can't drink. Period. Your body is damaged enough already. Can you imagine having fun without alcohol? Honey, lots of people fall into alcoholism in college.
My brother in law started drinking on weekends in college, just like you. Then he started to associate fun with alcohol. If there wasn't booze, he wasn't having fun. Now, he drinks at least 15 beers a day, has no social life, no friends, no girlfriend. He is staying with us right now because he was evicted. He spent all his money on beer. This morning we found him in the living room drooling on himself with a beer still clenched in his hand. His teeth are rotted out, he's bald, he used to be so smart and now he acts like an idiot. He has ulcers, insomnia, anger problems, and he's only 25 years old. Please don't end up like him. He lost his job for drinking at work.
Go to AA. If you don't have the willpower to resist drinking, check yourself into rehab. Hang out with people who don't drink. You are the only one who can save your life here. Please get help for yourself.