Hello~I am not familiar with this, but I am wondering, have you been tested for epilepsy, epilepsy is more than just the text book grand mal seizures, it can manifest itself in many forms, and weird sensations is certainly one of them. I would certainly ask your GP what he thinks and if there are any tests to help.
Another possibility, believe it or not, you could have some misplaced vertebrae in your spinal column, sometimes this can also cause these issues. I would suggest seeing a chiropractor, he/she will take a couple of x-rays and they will show if there are areas in your spine being "pinched" or "misplaced" If this is the case, a few adjustments might help.