Well, the PT seems to be of the opinion that it is my peroneus and achilles tendons that are acting up. She gave me some eccentric loading exercises last week for the peroneus which are going well (can't tell whether or not they're helping). This week she added eccentric loading for the achilles and it has resulted in the sorest calves I have ever experienced. Hopefully this is a sign that I just did too much too soon and not a symptom of something more being wrong.