I also recommend finding yourself a doctor who will help with pain management. I have a similar problem which also has no clear cause, tho I was found to have a congenital narrowing of the lower spinal column with a small bone spur and small herniated disk. My prior orthopedist was very medication averse. I finally dumped him and found another. After looking over my charts, films, etc he put me on Arthrotec 2 times a day and Neurontin at night which has helped more than I could have hoped for. Finding the right fit between doctor and patient is a key element to getting better and/or well.

Good luck!
Laurie