What Causes Intense Pain In The Lower Leg?

Hi, for the past few weeks I have been having intense pain in my lower leg. Had an MRI and Cat. It showed a tibial stress reaction. This stress reaction is in the exact spot that I had an Osteiod osteoma yrs ago. I am now 44. The Oncologist I was seeing referred me to an Ortho. The Ortho told me he was certain what the problem could be. He gave me a Cam walker and told me to come back in two weeks. A few days later, I had an episode of intense screaming pain. I called his office and asked for a bone scan. A few days after that I had to call my doctor to try to get an answer on the results of the scan. I couldn t directly speak with him. But his PA said that I had some uptake on my knee and ankle. She couldn t say much, but said the doctor stated that it is not arthritis and that he is clueless and may need to refer me to another doctor. I will be seeing my doctor tomorrow to go over the results and be reexamed. Would on ortho doctor refer me to another ortho? What could be the issue with my leg? The last few nights the pain has woken me up and the doctor has now given me some pain meds that work, but make me nauseous. Any ideas or advice? BTW, they say the tumor did not come back.