I take 120mg cartia xt for palpitations and rapid heart

Patient : I take 120mg cartia xt for palpitations and rapid heart rate. I am about 40lbs overweight. I have been on this medication for over three years. My resting heart rate is usually between 95-135. I have been working out give days a week the last two months or so and have lost about 10lbs. Recently I have become fatigued, weak, lightheaded and dizzy. My resting heart rate is now between 56-70 & dips lower during sleep. It fluctuates from 58 to 70 within seconds and seconds later is back down again. My last few workouts I am having problems raising my heart rate above 100 no matter how hard I tried. My cardiologist nurse said I'm fine and not to worry about it but I feel ill. How could this be fine?
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