My mother had two bypass surgeries. The first one was a quad, the second a quid,(one of the first arteries had to be repaired again). She had two angioplasties as well. She did fine on both. The last one was 20 yrs. ago. Im sure this surgery has been perfected so much by now. Recovery is long, but they have them sitting up the next day. No more laying around.
Its good to be scared, that shows your great concern for your dad. Im thinking he will be alright. Blessings.