Two possibilities to mention:
1. If your skin is tender to touch and burning is not affected by body movements and different positions, then it can be shingles (Herpes zoster virus reactivation in one of the spinal nerves). Nausea can be also from shingles. This causes burning pain going like a stripe from the spine to the front. Often (but not always) rash appears after some time. Neurologist would tell you, if there is any available painkiler for your situation.
2. Bulging or herniated disc or some other disorder in your thoracic spine (osteoporosis, arthritis..) could cause pinched spinal nerve. This type of pain would be affected by different body positions and would not be tender to the slight touch. Again, neurologist could say more.
Colleen, the DEA for years have a system to where they can monitor a Dentist that gives out too many opiods like Percocet or Vicodine, especially a General Dentist. Any situation as far as Dentistry goes to where a patient is in excruciating pain, usually because the patient has a very bad infection which if left untreated can cause an abscess. When a person has an abscess a dentist will lance and drain the abscess and give the patient a course of antibiotics and just enough pain medication to help with the pain and then when the full course of antibiotics is finished the patient will go back to the general dentist or the specialist to either get the tooth pulled or get a root canal. Your just mad because you can’t get your “low dose fentanyl” any more. My advise to you is to go to your nearest pharmacy and buy some Excedrine instead of picking on Dentists!!