Hi Hammerhead,
This is a common problem -- people with chest pain despite normal stress tests.
Rarely we do a cardiac cath to make sure there is not coronary disesase, but also to reassure you that you don't have significant coronary disease. It is true that anxiety can cause pain that meets the description for angina but the coronary arteries are completely normal.
What I usually advice people to do is maximize risk reduction (blood pressure, blood sugar, weight, don't smoke, eat right, cholesterol). I will assume you don't have a strong family history of early heart disease since you didn't mention it.
Given your age and the negative stress tests, I doubt this is angina and if you already have a holter or event monitor and know these are pvc's, I wouldn't do much more.
you should know or have already had:
cholesterol screening
ekg
maybe holter monitor
stress test (done) -- I assume your symptoms haven't changed since your last stress test.
I hope this helps.
good luck!
I guess if you've been checked out for everything else, it's worth it to try one more thing. Since they are "physical" medicine doctors, they might even help with an exercise program. Good luck on the weight reduction!