I've been on blood pressure medication for yrs. I began feeling light headed and dizzy. The nurse told me my pressure had dropped. What could cause th?

Less need for meds. It sounds like the BP meds are more effective and your BP is lower. There are a couple of considerations: you may be healthier and if you have made lifestyle changes (diet, weight loss, exercise) this could lower your BP naturally.Thus the BP meds may be "too much". Also, if there have been changes in your meds (ie. Going from a beta blocker to ace inhibitor), the current one may be more effective.