Feeling Fed Up

I'm just fed up with my bf. We just had a baby and things have been bad. He has a dissociative disorder. I don't really remember the name. I honestly still have no idea what it means to dissociate. How he describes it is he steps out of his body. So the baby could be crying and if dissociates, he will just stand there blank face, not respond to me and I have to wait until his little episode is over. I will say it used to be a lot worse and every time something triggered him he would dissociate. He started medication and it's gotten a lot better but I don't have time for him to ve randomly dissociating. I've been telling him to change his meds for something different but his excuse is medication isn't meant to cure his disorder. It's meant to make it easier to live with. At the moment he only dissociates when he gets really stressed and it happens maybe twice a day which is better than 10-15 times a day, but it's still so fucking annoying when it happens!