In the meantime, Kaia (my PT) said that I need to be wearing shoes with inserts at all times in order to protect and support the arch of my foot while the AT muscle isn't (goodbye, cute summer sandals.). She also said that I should refrain from doing any extended walking, or walking/standing on uneven surfaces (no hikes, walking on gravel/sand/grass) and no balance exercises that aren't on the floor (BOSU balls, balance platforms, etc.).
Kaia suggested I stick to the bike and the rower for cardio at the gym (no treadmill or elliptical, as they put weight on the leg), and work on upper body and core strengthening exercises. I also have limited strength, flexibility, and movement in my left hip, left side of my lower back, and IT band...so all of my at-home PT exercises are related to fixing that issue, just until the irritation in my AT muscle goes down.
It's time to set some new goals...I'll post them as soon as I've written them out. Thanks for everyone's support. I'll hopefully be back up and running (ha!) by January 2012.