Stay tough needtostop1. If it were me, I would sit this birthday out and continue to rest and recover. Just tell your friends you aren't feeling well, and that you don't want to go out. The risk of going out and drinking again just seem too great. Or tell them to come over to your place with a cake, no alcohol allowed, and talk, play a board game or watch a movie or something. Your friends should understand your position and honor it.
If you get sober and healthy, there will be many more birthdays down the road you can celebrate.
Just my $0.02...