Here is hoping your Dad continues to recover swiftly. I know the feeling of worrying for your Dad's well being. My father had a scare last year falling off the haystack while moving some square bales (10ft drop) and had headaches for an entire week. Thankfully he came out fine, but damn lucky after landing on his head like that.
Also worth noting, my Uncle has had heart rhythm problems his entire life. But with medication, he has been just as active and healthy as anyone else I know. He noticed problems running track when he was in high school, now he is in his 50s.