Hey, don't go thinking that way. There are people who carry stress no matter if their life was all sunshine and roses. Your Dad's life was meant to have you in it. That would have been one of his biggest blessings.
Kids are meant to give their parents a run for their money. Taking care of my son (AS/ADHD/Tourettes) is a full time job in itself and if I died of a heart attack tomorrow, it wouldn't mean it was due to him. I wouldn't trade a single day of my life's journey. You were a tough kid who turned into a good man. Your dad would be proud.