Are you really looking for pain management or did you hear from a friend that that is a good way to find some recreational drugs? Stay away from recreational drugs... they dont improve your life. If you want serious pain management.... then you wouldnt want a walk in service anyway.
No. You need to be referred to a pain management clinic by a doctor. I really hope you aren't just trying to play the system for drugs. People like that are the reason pain medication is so highly monitored and make it difficult for people who have a legitimate reason for needing medication.