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Hi, welcome to JustAnswer. I'm Dr. Hasan and I'll try to help you. I am reviewing your question and I will get back to you as soon as possible.
Thanks a lot for waiting. I am sorry to hear about your problem. I am going to address your primary concerns but later you can ask anything you want. Yes all three possibilities are there. Athletes can have low heart rate and in that case it is considered to be normal. Similarly both of your drugs can cause bradycardia. Here are the links for your help. Under the heading of cardiovascular you can read bradycardia yourself.
you shouldn't worry at all regarding your low heart rate. In my opinion it is likely to be due to exercise or drug related. If it'd drug related, your doctor can simply change the drug and check if it's the cause. If it's due to exercise then there is nothing that needs to be done. I wish you good luck and that you get well soon. My goal is to provide you excellent service but if you have received anything less, please ask anything you want. Your excellent feedback is requested and will be appreciated. Regards