You're doing so well. This is hard for you and H, but consider this. If this was *easy* for him to get through, it would mean that it's part of his character, part of who he is and does not mean much to have had an A.
Just my oversimplified way of looking at things now, since I am tired of complicated analysis (geesh).
So, since I'm not much help, I thought I would stop by your curb, get some chips and salsa, and give you a thumbs up.
One bit of advice: at some point, you and H will slowly have to stop picking at the scab, stop looking at the scar while it slooooowwwwlllllyyyy heals. Stop looking at the wound, wondering, thinking, picking.
It's not easy, and it's not sudden and it's not without LOTS of counseling and healing, but little by little, mama.