I feel bubbly feeling there to sometimes but I have reflux.
My guess would be that the big flop is a PAC or PVC where the atrial or ventricular has had a lot of time to refill. So when it pumps it out, you feel a harder beat. If there has been a short refill time, it feels smaller like a little flicker or thump. That is how my cardiologist explained it to me a long time ago. I don't know about the bubbling feeling. I actually have felt that a time or two but it is when I have burping. So I'd chalk it up to acid reflux stuff.
wow thanks for the dr's example of the thump i never though of it having more time feel up , i have a lot of little ones sometimes in a row and really, so now i know why its not having time fill back up. humm hope that not a bad thing .but it makes sence. thanks again