PVC's are very scary and frustrating. I've had bouts of them since I was in my 20's, but didn't know what they were until I was in my 30's. I also had the EKG's and holter monitor, and was told by the cardiologist that what was happening was so common that he could literally go in and pull 70% of his charts and show me the same thing.
At the time I wasn't really comforted by that comment because I was figuring most of those charts he was using for an example were probably 75 year old people too. Since then, I have had many episodes of PVC, and also PAT's. They seem to last for several days in a row, and then disappear on their own for long periods of time. Some of them have been pretty scary because it seems like the pause is pretty long before it starts beating again.
There are a lot of factors that can contribute to PVC's. Hormones, dehydration, anxiety, and electrolyte imbalances to name a few. Unfortunately, some people just get them and never can find the cause.
Beta Blockers can help, along with magnesium and potassium sometimes. My doctor told me chug down some ice water if I get a bunch of pvc's in a row. It's supposed to get the rhythm back to normal.
Anxiety does make them worse, so try to calm down if you can.