If your thyroid is OK, and your heart has been repeatedly checked out and found to be OK, too, then, as you suspect, the problem is how
to deal with the fear. For people who have a medicine phobia (pretty common, actually), treatment is necessarily going to be more difficult. You might try talking with a psychotherapist to see if you could learn some biofeedback or other mental exercises to help you calm yourself. Another resource that might help you is a small, inexpensive book by Dr.