Sorry you are experiencing distressing PVCs. I usually post in the Hepatitis forum, but your title caught my eye...
I have had PVCs since age 24 or so. I am now 51. Like you, they would go away for years at at time. Every time I experience a bout of them I am certain that I will be dying at any moment. I also notice that when I am very tired, have alot of caffeine, and mostly the STRESS, they really flare up.
I go to the doctor. Get an EKG, or have done a couple of holter monitor studies. All have turned out to be fine. STRESS. An awful thing. My doctor did tweak one of my blood pressure meds to atenolol. This has decreased the PVCs by a huge amount.
You are not alone. But, go to the doctor! If it is nothing, you will be reassured, if it is something, you can get the proper care and treatment for it.
Best of luck to you. Post back and tell me how your doing.