If you want a lot of visibility and answers regarding the drug itself, I would recommend checking out Basic Drug Discussion. But if you're looking more for support in recovery, try The Dark Side. I wish I could help you myself, but I have little to no experience with painkillers. All I can say is a lot of us are going through similar things, and therefore can support you in your recovery, if that is what your goal is.
I hope you find what you're looking for, and wish you the best.