You'd think the doctor would have thought of Costocondritis- it was an easy dx for my dr when I was pregnant 25 yrs ago.

I'm wondering if it is a muscle spasm or the nerve that runs under there??
can't recall the name right now... here it is- intercostal nerves

Many with TOS have gone to ER thinking heart because of this similar thing.

I assume the EKG was normal and any other heart related tests?

How are you doing now - any change?