I agree w/ bypeep, mine feel the same...but since I'm not wearing a monitor all the time, I'm just assuming they are pvc's and pac's....who knows...but I definitely feel them! I too feel like I'm fading, my body feels like it's off kilter, like when your young and teetering on a curb, trying to keep balance...and at the same time, my stomach feels like it's "dropping"....and this can happen back to back sometimes! Like within minutes of eachother.
<--- I get momentary dizziness. But I think I'd describe mine more as a fading sensation. Like when I get a long run my vision seems to darken a bit and my head gets fuzzy. I also get this strange tingling in my fingertips just after it comes back into normal rhythm.