You had mentioned alcohol IIRC, is that what you're struggling with? You also said your doc prescribed GHB... that's one hell of a combo. I hope you're doing well, man. Kick back, relax, clear the skeletons out of your closet and get back to your normal life. No shame in going to rehab. There are some things that people need help with and it takes a real man to ask someone else for assistance with sensitive matters like substance abuse.
Take care of yourself, buddy!