I've absolutely found a correlation between PVC's and stress. I had mine come on "out of the blue" in January after a really bad stomach bug. This also happened to be the same time a new semester started at school. I contributed the PVC's to the bug though. ended up having an Echo, EKG & stress test. All fine. A few months later, they "disappeared". Ha - BACK AGAIN, and guess what's going on this week? Finals!!
) I also had a really bad night of them a while back while we were under a tornado warning and the sirens kept going off.
So, I think if there is a correlation between HBP & PVC's, it's stress! Stress will give me both. It's just a matter of keeping a clear enough perspective to not travel down that slippery path to obsession.