Have you ever tried acupuncture? I never have but have heard other people talk about it.
On a side note though, just my own opinion, I'm not a big fan of heavy reliance on chiropractic practices. No bad prior experiences, maybe naive on my part, but just don't like the thought of continual forced manipulation of the joints. If that is what they are doing.
Have you tried Physicsl therapy, more if a non-forced muscle stretching and strengthening routine? Again, not really knowing your specific ailment. Your melon stuck in upward position in your gluteus maximus?