Could anyone tell me what this is. I sometimes get this strange feeling in lower throat, upper chest area. Feels like somthing is vibrating or moving there. It lasts for only a second or two. I can then feel my heart pound because I'm surprised or scared at what is happening. I don't get dizzy, nothing hurts, just a strange sensation. Does not happen very often. Mainly notice it when sitting. Never seem to notice it when I'm doing something. Kinda feels like a burp or gas or something.Hard to describe. I've been pretty anxious here lately but this just happens all at once, nervous or not. Any ideas? I ofetn experince strange muscle spasms sometimes too. Thanks.