If you can find a sports medicine doctor, preferably one familiar with cycling, you will get better advice than you get from the average general practitioner or from the internet. When I was running (1000-1500 miles a year), I had a serious pain caused by overpronation. When I told a GP, he said, well, just stop running. A sports doc diagnosed the problem, prescribed custom orthotics, and I was back to painless running in a couple of weeks.