I've had all of these exact same symptoms and tests. It turns out I have mitral valve prolaps (dx back in 2002) which makes me wonder if lyme has been in my body longer and just set off with the newest bite!
Anyway, they come and go randomly and are most bothersome. I figure if I haven't died of a heart attack yet well then I guess it's not my time.
I haven't noticed an increase during treatment (been going, slow going, for about 2.5 months now) They just seem to come and go in "flares". I noticed they were the worst and longest duration when my body was seriously in a state of inflammation. Tumeric anc Cuecertin has helped. I also take a lot of magnesium and notice a definate increase of palps and pvcs if I don't.
I was doing alright but even just this morning was awakened by the racing heart. It is one of my most aggrevating symptoms
Hang in there, I've read that a lot of other folks had these issues and they eventually went away...I am looking forward to that day!!!