Hi Rachel,
As I mentioned, both my Primary Care Doctor and my psychiatrist think the vibrations are caused from anxiety. I've recently seen a neurologist for testing for neuropathy and not all the results are in yet. I did ask the neurologist if she thought the internal vibrations could be related but she hasn't given an answer on that. Nothing has been ruled out yet. I am being tested for neuropathy due to strange itching, stinging, and stabbing pains all over my body without any sign of redness of rash. This has gone on for about 10 weeks, but the vibrations started much sooner. Thanks for asking.