The doc says shoulder bursitis, the physical therapist says rotator cuff impingement. (pinched nerve). I just wonder if I need an MRI for a diagnosis, or if all these are treated the same. Anyone have experience with this? I see the MD again in 2 days, thanks for your input.

Whenever I walk there is a sharp pain in the sides of my ankle and the back. It hurts especially in the morning and when i sit down for long periods of time. I probably injured it skateboarding, but is there anything to do to relieve the pain because it has been like this for a couple days. Thanks.