I get this pumping bubbling feeling as well, so long sometimes i also check my pulse and it seems to skip, i don't know what it is or if it's the same as yours but mine seems to come from the centre of me, like in my middle.
I asked him a while back and he just said possible anxiety attack. Like the response you got really. I must admit though I get a bit frightened as well as I thought it was me heart missing beats, but one of the other doctors said it was okay, though how he could tell without an ecg I dont' know, he only did a blood test :o(.
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