Kayla, you're just going to have to decide to go through it and do the best you can. Most of us have been there. The best way to prevent this from happening again is to stop drinking.
An alternative would be to come clean to your boss and tell him you need to get some help. You may lose your job. He may sympathize and give you time off to get help. But based on what you're going through, it sounds like you need to make quitting a top priority. GL