I also experience internal vibrations that had no apparent cause except thinking I have gone off the deepend until I read everybodys comments. I never even considered that it could be associated with my digestive issues and they both started about the same time now that I think about it. Thanks everyone for your input its a relief to know im not crazy, which was becoming very upsetting for me. My lower body vibrates and it feels like the floor is vibrating and my side of the bed and I can hear the vibrations( or I think I can) but they arent real to anyone else. To me it feels like the furnace kicked on and is running when I feel the vibrations. Has anyone figured out a way to stop them when they happen?