I had a bad case of tendonitis in my right ankle this past Fall when I added too many miles (running) too quickly. I did some rehab exercises that I found in Jennifer Rhodes' book -- sorry can't remember the title, but it's an excellent anti-injury handbook (Peak Fitness? something like that). Plus, I wrapped it in an ace bandage, stopped running, and took advil. I kept riding, though. It took about 2 weeks til it got better. I'm still doing some of the rehab exercises to keep my ankles strong and I'm back to running with no ankle woes.