I commented in the heart forum on your post...hoping itdood or jerry respond to your post. They have great info. and advice. Good luck to you.
Well, you have certainly had very thorough work-ups, including being watched over by a cardiologist. If all of that doesn't ease your mind that indeed you don't have a heart problem, then I think it is time to try to more aggressively address the anxiety. If your problems are anxiety related, then, as you address the anxiety, your symptoms will improve as well.
I have PVC's on occasion as well as palpitations, and know that they are not the most pleasant sensation...but what you have to understand is that they are harmless. I will also tell you....that I also used to take prn Ativan, and almost EVERY time I had to take one, I noticed a marked INCREASE in PVC's and palpitations the day or two after the dose. I addressed it with my docs, who said they couldn't explain the correlation, but obviously the two were related in some way for me.
I eventually switched to Xanax and have not had those symptoms anymore. Im not saying that this would be the same for you...just wanted to share that with you, because it was something very interesting and Im still convinced that the Ativan worsened those heart related sensations.
What have you tried in the past to help with anxiety? Personally, I think you would possibly benefit from trying another beta blocker that would both help your heart issues, and also the anxiety. Inderal is a good one. It helps to reduce your resting heart rate and help diminish the PVC's, while also having a lot of anti-anxiety properties. It's worth discussing with your doctor...and since the Lopressor didn't work for you (personally, I have seen a lot of people not tolerate this med), there ARE other beta blockers that may indeed help you. Just know that you have options here!
Let us know how you're doing!