Weird mother/son dynamic noticed after marriage? what would you do?

Anonymous
Im 29 female with a 30y. o male we live together and 10 years later got engaged I was friendly with his whole family even going to church together and caring for their children helping them move and everything.. the guys mother went psycho when she found out and was heard yelling at my husband literally at the top of her lungs in a backroom saying “i will be damned before you put any b**ch before me!” He didn’t even respond to her as he says he felt confused and seemed to just be shut down the entire time she was raging. he explains a state of shock and fear of his own mother even though as an adult.. he felt shame guilt and embarrassment due to me hearing it and him not being able to stand up to her.. the day of our wedding his family out right refused to stand in any photos i or my family was in only taking pictures with my husband.. on our honey moon his mother stopped taking care of her well controlled diabetes and ended up in the E. R calling my husband repeatedly and having his sister and father call him as well saying that he doesn’t care if she dies and guilt tripping him the entire honeymoon week he was distracted and stressed.. we couldn’t drop everything and make it there either way she was out the hospital within one day.. his birthday another hospital health scare due to her stopping her meds again and Christmas and even this Mother’s Day she stopped taking her medication again and passed out hitting her head another E. R visit where she’s constantly telling him he is responsible for her health and if he would show up she would get better she has told him he is sacrificing his family (her his father and his sister) for his wife and job.. I’m lost I don’t know what to do
Weird mother/son dynamic noticed after marriage? what would you do?
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