My chronic PVCs strictly accord to my diastolic BP point (which cases which?)

[MrGlitch]

Since the beginning of June, I've experienced up to 20,000+ PVCs per day. Some days I have them every 2 or 3 beats continually for 24 hours at a  time, non-stop. I've been to ER 4 times since 2009 for these things and I've seen two different cardiologists. I've tried metoprolol and propranolol - neither has helped. And I've experimented with eliminating and changing certain parts of my diet, as well as increasing my daily exercise routine. None of that though has seemed to result in a correlative difference in the misbeat frequency/patterns I'm experiencing.

I had an echocardiogram --ordered by the first cardiologist-- which showed my heart structure to be normal. And I wore a monitor for one week --ordered by the second cardiologist-- which, despite that it recorded my hugely frequent PVC's, she didn't seem to think they were life-threatening. Interestingly, this second cardiologist failed to listen to my heart with a stethoscope one single time during the two visits I had with her. I'm unsure whether that's something I should be concerned about.

I made attempts to express to both of the cardiologists I saw that there is one definite correlation I have observed about my PVCs. That is, that when my diastolic BP is higher (it will raise about 10 points periodically and remain there for a while), my PVCs entirely vanish. Then once the diastolic numbers drops back into the range that they usually maintain, my PVCs resume in plentiful form. Mind you, this is when I'm measuring my BP at home in private. I suffer from social anxiety, so when I go to a medical facility my diastolic BP elevates about 30 points so my PVCs then become virtually nonexistent. This has happened during my ER assessments and during my cardiologist appointments.

(Note: The following description is from when I am not taking medication and it has been out of my system for a long while.) At home, irrespective of my diastolic BP numbers, my systolic numbers are always 110 +/- 3 or 4. That seldom ever changes. But I still experience the two aforementioned states of my diastolic pressures. They are: a typically low range (55 to 59) which is present approximately 90% of the time. And an occasionally high range (65 to 71) which is present the remaining 10% or so of the time. Again, the high diastolic periods always correlate to no PVCs at all; whereas the low diastolic periods typically correlate to huge PVC flurries.

My questions are: 1) What does this mean? And 2) which causes which? Do the low diastolic periods somehow cause my PVCs? Or do my PVCs cause my low diastolic periods?

Any opinions will be appreciated.