I have Dull ache and pressure feeling in my upper shin from running for many months. Bone Scan result are out.?

Sounds like a "stress fracture" to me. It doesn't show up on many scans or x-rays, take the Dr's advice and give the running a break for a few months. It should get much better. I have had a couple from running, and with rest for 90 days they went away. Hope this helps.