Most Helpful Guy
Go to AA. You'll get back on the wagon, make friends who can support you from experience, and learn fundamental life skills that you either never learned or took for granted.
Most Helpful Girl
Start reevaluating your life.
You need real friends not trash. If all your friends left you when you were going through a hard time they weren't your friends in the first place. Don't mourn the loss of something you never had then. There are nice people out there, cut down on partying and try to make normal and sincere friends outside of the party culture.