I'm all too familiar with this feeling. I've had attempts at staying clean before where I'd feel really good in the beginning (pink cloud), and I've had attempts where I felt terrible from the beginning. Either way I always ended up feeling awful and using again. I think some type of work needs to be done right away if we are to have a chance, for me at least, whether thats therapy, 12 steps, exercise, etc. Right now I have a week clean and I've been trying to get back into things that made me happy before I started to using. I'm looking into going back to music lessons actually. I know if I sit in my misery and don't at least TRY to do something about it, nothing good will come out of it.