Lower leg pain, feels liked shin splints?

I have been experiencing lower leg pain off and on for about 6 months now. It seemed to go away for a while but now it is back and it is very painful. It feels like deep bone pain where shin splints would normally be. I am not that active so I didn't injure myself. My Dr. sent me for leg xrays and several blood tests for lyme, and rhematoid Arthritis and everything came back normal. Now she is sending me to a vascular Dr. which I am not sure will warrant a diagnosis or not. Does anyone have anything like this and what do you think it could be? The pain can be very bad at times in the front of my leg where the bone runs up and down. Exercise seems to aggravate it but sitting does also. Any ideas? Tweet