I have avnrt-my ecg is always normal when I am not having symptoms. Be persistant and demand more. It took me 11 years and many sleepless nights worrying.
I have found only a few of us that feel "vibration" in the chest. I never had it during an event monitor or other, but I'm still alive after 31 years. I sometimes think it might be an air bubble that escapes and feels like a vibration at times. I get flutters only sometimes when I feel it, so maybe, since the vagus nerve may be affected, one might cause the other. Just a thought! I don't get nervous much anymore (at least no more than with other feelings) but it is weird, isn't it?
It could be A-Fib. It can make the upper part of the chest and neck feel as though it's vibrating. Here is an excellent overview: http://www.a-fib.com/Overview.htm
How long do A-Fib attacks usually last? I feel this mostly at night when I am laying down.
It's so hard to differentiate what is an actual heart symptom, or what is being brought on by my underlying Lyme Disease.
I just posted something similar a few weeks ago, on another forum.
I was having a lot of vibration in my chest and I was also experiencing pressure (pressure I have had before however). I couldn't really call it a flutter or a PVC, but I could definately tell it was vibrating. It went away after a day or two-it was never constant, it just came and went. I have given up trying to figure out what is wrong w/me. My doctor keeps saying stress.....
I hope you feel better.
I have had that "vibrating" usually when I lie down after drinking water or when I feel bloated. I am starting to think it is gas, I do not recall having that feeling when I am standing. I hate it though, it IS definately weird.