I don't know all of your story but just wanted to give you some support before your phone call. Absolutely do not ask for the letter now. Act as calm cool and collected as possible.
I'm not a vet but I would let H do most of the talking. I imagine he is going to expect you to cry and get upset (rightfully so!) but don't let him have the satisfaction. Leave the conversation with him hanging up the phone scratching his head wonder wth?
