I have been struggling with peroneal tendonitist for about a year now. It started last May and continues today. I let it go through the summer getting ready for a fall marathon, but then took a full month off in October to try and let it rest. It came back strong in December when I finally decided to see a sports medicine doctor. 2 months off from running and physical therapy for January and February. It seemed better until the middle of March when it came back. At this point I can run for about an hour with out any sort of pain or problems. Anything more than that and I get the pull or burning feeling for a second or two, a few times during the run. This usually only happens on runs over an hour. Biking seems to affect this as well, but not nearly so. So my questions for those that have had this problem, or those that know about it (doctors and such).

1. How long does it take for this injury to fully heal?
2. Are there any exercises I can do to help fix this?
3. Do I need to stop running for a longer period of time to let this heal?
4. If I keep running, will it ever heal?
5. What is the best course of action to get over this? I've been through PT, and have been doing my exercises and stretching. It seems to help, but not to the point where it is 100 percent.

Background info:

Life long runner, 6 years or so in triathlon. 15 marathons, 5 IM finishes, etc. 6' 1" 185 pound when the injury happened last year- but a good 10 pounds heavier now. IMWI coming up this year and I need to start running.....

Any help or advice would be greatly appreciated. Thanks!