Diphenhydramine
"I took this as a sleeping aid due to a very hectic schedule that was stressing me out. It did help me go to sleep and stay asleep but I noticed that I was somewhat dizzy at times during the day. Over a six week period the dizziness became worse. I went to an ENT thinking perhaps I had an ear infection that was messing up my balance. He told me to discontinue the diphenhydramine and try valerian root (I didn't want to use any more drugs) and it would take time for the drug to get out of my system. I've been off the med for a week and still have some dizziness going on. This drug is definitely not for continuous use!"