[Ramrod]

That might actually be of some help as long as when it's sitting on your pelvis (iliac crests) it reaches slightly above T12 without putting undue compression on the T12 level. You want the belt to cause some long axis traction/decompression of that level without actually pressing too hard on the painful bit. It would be good if you could find a MSK practitioner of any kind who is confident in treating this kind of thing though.