Unresolved Burning Pain?

Burning pain throughout body no diagnosis still.   MRI of brain fine.  MRI of spine showed some nerve irritation and arthritis.  Physical therapy has helped eliminate most of the vibration I was getting in arm and shoulder. So that is better.   Thyroid test normal.  No diabetes.  Blood pressue good. Nerve test showed carpal tunnel, but already knew I had.   Still neuro, pain doctor, primary care doctor none know why I have burning pain throughout body.    Some days are calmer pain and other days are horrible.  I asked could my lower left leg  injury from years ago possibly be the issue. Meaning since soft tissue and tendons were all impacted, maybe I don't know.  But they dismiss that shake head no and that's it.

Any suggestions or idea of what causes burning pain throughout body?    Don't know what to do.

Only other info I could tell you about me is I am overweight but do exercise.  Had total hysterectomy and I am in my 40's.