You had 120 days, so you know you can. Don't let alcohol win!
You feel terrible right now (isn't alcohol a fun little poison?) in part because of the biochemical effects of alcohol...those feelings of failure are feelings, not facts, as they say.
Back on the horse!
P.S. Try to drink a lot of water and something with electrolytes if you can. Eat some protein...peanut butter on wheat toast is good. But if you really can't sit up straight, call 911 or have someone take you to the ER.