What are the reasons for bradycardia and seizures in an 18-year-old boy?

Hi doctor,

I am an 18-year-old boy and I weigh 119.8 lbs. My height is 5 feet and 8 inches. I was diagnosed with bradycardia last week. I went to the doctor since I am having frequent seizures for the past three years. I was said that there was nothing to worry but when I looked up at the condition on the internet, it showed all the symptoms that I have. My mom also had the same issue when she was a kid, but she said that it went away after some time. We waited for three years to check if my problem would also resolve but it did not. I have been trying to figure this and the doctors told me that I need to improve my eating and drinking habits, but it never helped. I was asked to do a blood test and the results were fine. I also took an EKG which showed that my heartbeat was slow and that I had bradycardia. I am currently waiting for a call from the cardiologist since they told me that they would give me a heart monitor and a clicker to be used every time I experience seizures, but I have not heard anything in a few days. I have an appointment with the doctor in a few weeks, so I need to know about this further. Please help.