Saw a different doc (finally) today. The pain is, of course, gone - but the fact that it happened is concerning. He does not seem to agree with the initial diagnosis.

They are testing to make sure I don't have a blood clot (eek! - I hope not), since that was not tested before. They have also scheduled a stress test. Assuming all is clear, I'm cleared to ride though my training is well beyond inadequate at this point