Miscarriage ruining my relationship

In January I had a miscarriage. We’d already bought things and picked out a name. It would have been my SO first baby even though I have two from a previous marriage. He was very helpful though the process of passing it and there for me emotionally every step of the way. He was incredible. But I could see how it affected him. It was really difficult for him too. We’ve tried to talk about it but it’s so hard. And now things are different between us. He’s drinking too much. I’ve been depressed. I’ve been super sick. I had a cyst that I may have to have surgery on. I’ve been having migraines a lot probably due to stress. And he’s been spending all of his time away from me. He’s always out fishing or he’s up all night drinking. When he is here he is distant. I understand he needs his own time to grieve the loss. And I understand he needs his own space. But we’ve been fighting none stop. He’s so hateful when he’s drinking. He’s agreed to stop drinking but I’m scared that won’t fix the problem. I just feel like he resents me bc of the miscarriage even though he claims he doesn’t. Idk what to do to save this! Any advice?