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I was given nifedipine to control high blood pressure but felt more giddy.? - nifedipine more drug_warnings_recalls

Then, if for ECG monitoring. ECG was within hours of my medication (nifedipine), and the result showed that it had bradycardia. My heart was about 50 (rarely exercise is normal?). I refer to a specialist earlier. Now, I wonder if the result was caused by medication? Or I am behind the slower heart rate and should not be had on nifedipine?
And now listen to this drug and my heart was slightly improved but still low around 53rd
Some say I should continue my medication because I still think my blood pressure have neck pain. Need advice seriously. Thank you.