I've been taking Tenormin for many years, but lately it doesn't seem to do anything. Can medication such as Tenormin stop being effective?
The reason for Tenormin is MVP - I was diagnosed in my early twenties and have always had symptoms. But my blood pressure was always low and most of my symptoms included tiredness/dizziness, chest pains, and 'flip-flop' or irregular rhythm. Now, however, in my mid-forties, my blood pressure has been runnig higher than usual and my heart always, always beats fast. For several months now, I've had 'fluttering' in my heart which wakes me up at night and/or keeps me from falling asleep. These episodes happen every 10-30 minutes. Sometimes during exercise, and sometimes when I am doing absolutely nothing physically demanding: watching TV, etc.
Why would the medication stop working? Or is there another possible cause for these 'flutterings' - stress (I've always had plenty), age, hormones, etc.?
I've had EKGs and 30-day heart monitors and stress tests. They all came back normal, confirming MVP. What I can do to stop or ease these episodes? Taking more Tenormin does nothing, my heart still races all the time.