I am wondering about some numbness that I get fairly easily in my body. I looked through the Internet and saw that this numbness can be caused by an underactive thyroid, and of course, the heart. Does the vagal nerve stimulator that I had placed in my chest about 9 years ago to help with my epilepsy affect the thyroid in some way? Went to the hospital to see about any problems with the heart about a year ago. They tested it, and drew some blood. They didn t give me any warnings about heart problems though. Or, does this have anything to do with all the prescriptions I take with my epilepsy and depression-- Depakote, Lamictal, Felbatol, and Levocarnitine (Carnitor)? I heard about some of the other symptoms that the underactive thyroid can cause that I also have-- being sleepy very easily, depression, and often feeling cold.