How would you go about this situation?

Married for 9 years to an army veteran. We have 3 kids and have been through a lot (his drug addiction, bipolar, ptsd, cheating and so on) it seems as if he takes a step forward and two steps back constantly. This last incident has me shook. Our 6 yo was giving me a hard time about putting eye drops in his eye for pink eye and my husband comes out of the room and gets on top of him and i tell him to get off and he yells at me "get the fuck off of me!" And i step back and he puts the drops in.his eyes and smacks him on the face because he was giving me a hard time. My son's eye starts to bleed. I start crying because wtf just happened and walk away because i dont want to alarm my son. My husband realizes what hes done and cleans up our sons eyes and says its fine its just the pink eye coming out and i said no! I need to take him to the doctor that's not normal and he goes on about how they are going to report it and this was just an accident, he didnt mean to hit him to make him bleed. I checked on.him and his little nose bled a little and he has a bruise on his nose. I made a virtual appointment and the povider said it was just a popped vessel and wasnt going to report it. I am so angry with him for doing this to our son. Him and our 4 year old have 1 week left of school. Hes missed a few days because of the pink eye and now more days beciase of his little bruised face. I keep telling my husband we are done i.dont want this anymore and he keeps trying to convince me about how much he does for us and that he loves us and how sorry he is and doesn't want to lose his family. I have been a stay home mom for 6 years. We also have a 2 year old that is not in school so getting a job that fits everyones shool and my schedule will be tough. My parwnts are 2 hours away and i dont want to stay there too long. The girl he cheated with has her kids at the school closest to my parents house and i love the school they go to now, the teachers are awesome and they are in a dual language class which i chose to do for them and is difficult to find a good school in an affordable and safe neighborhood. EDIT TO ADD : I told the doctor exactly what happened, she said she wasnt going to report it and leave it up to my judgment, i also told his teacher about it when went to drop our 4 year old at school, their classes are right across the hall and she asked about him so i told her what happened and she said it was an accident and everything would be ok and gave me a hug. I feel confused about this situation but i feel like i have to at least try to make it on my own with with the children. Another question i have is how much should i allow him to see the kids or be alone with them? I might need help picking them up from school, is that too much responsibility to give to him?