Tell him. Tell him everything you wrote here. And more.
I raged for two whole months. Every night we would put the kids to bed, wait till they were asleep, close our door and I would let him have it. I tore him a new asshole every night, pretty much. We discussed every little thing about his A that made me sad or angry, and mostly for those 2 months I was angry. It was not character assassination, it was about my feelings in the aftermath of DDay.
He took it, and held me afterwards and apologized for his A. I also beat the bed on occasion. At one point i was so full of rage I woke up with the idea that I should go out into the woods with a hammer and decimate a tree, something I'd done and found helpful during CSA therapy years earlier (I didn't because I would have had to do it alone that day). One of the last times I raged at him I actually hit him, repeatedly, with a pillow.
All this to say that anger is normal, keeping in mind anger masks sadness. I truly believe in "putting it where it belongs" meaning directing most, if not all of it (sadness, frustration, anger, dissapointment, hurt, ect) to the person who created it. We were also in MC and I was in IC. fWH went into IC at about 7 months in.
I'm not angry anymore, I'm a little sad, but mostly I accept what happened. The other 8 months have been relatively peaceful, full of difficult conversations, intense emotions, therapy, reading and SI, but the rage has passed, I believe because I expressed it.