Long pause after PVC...or heart failure?

have you had stress test done? even though you have had your episode while rest, your report of exercise intolerance should be looked at, with a stress test. holter monitors is helpful but if that event doesn't happen when you are wearing it, then the test will show up normal. how are your vital signs, like your Heart rate, blood pressure, pulse ox (to see how well you are oxygenating), etc... there is a condition called "takotsubo syndrome" that is transient (meaning it goes away). see the link below. it's not necessary a medical site, so it should be not too technical for you to read. You know your body better than anyone. be consistent with your care, and maybe ask for a second opinion?