What Causes Variation In Heart Beat And Dizziness?

I am 61 years old, 5' 10", 178 lbs., My blood pressure is 120/80, I am hypertensive for 15 years, I take norvasc 5 mg. and concore 2.5mg once a day. I am having this sudden, almost a split second dizziness, as if it will knock me down, but just as instantly, I will be able to recover. Then this will be followed by heart palpitations. My kind of palpitation involves only a feeling that my heart is pounding harder than usual rather than an actual increase in my heart rate which stays at 65 to 70 beats per minute. I'd have a 24-hour bp monitor, what was seen was that at that time when I felt that dizziness, there was a skip in my heat beat which my doctor says is not a problem. But I feel pretty uncomfortable with it and I want the problem solved. Thank you.