I came here looking for answers to the same problem.

I did my first tri yesterday and it made the tendon pain much worse. I have an ankle support on and it helps a lot. An ace bandage would help you if you don't have an ankle brace.

For me it's and "oh sh$%" kind of pain that shoots up my ankle. If I were to step on crooked ground or step down a curb right now I'd have to grit my teeth.

I am going to wear my crocs to work tomorrow, they sometimes help my feet.

Does any of this sound like what you are experiencing??

Hope you feel better!