Constant Burning Pain Head to Toe?

I have an internal burning pain/burning sensation throughout my body and I am desperate for help. The pain is from head to toe. Sometimes I even end up with bad headaches. I have been suffering for a years now and it's just getting much worse. I had a total hysterectomy last year and my hormones are within range. The pain existed long before the surgery. I have a long term injury in one ankle/lower leg and it has never fully healed, remains swollen. Foot/ankle doctors just have me wearing compression stockings and orthotics. I walk fine. I am obese.  Blood pressure meds 10mg Lisinopril that keep blood pressure within normal range.  

I have had Hormone test, TSH, T4, Testosterone, Comp Metabolic Panels, CBC, ANA test and all are within range. PCP just put me on presciption vitamins and he thinks I may have nerve irritation that is causing me all this burning pain. I had MRI years ago through ER, nothing found.

I feel so much burning pain and don't know what to do.  

What is next step toward getting help?  I have only worked with my GYN and PCP doctors at this point.