Hi HiddenByHIPPA. I am sorry for the loss of your relationship the way it used to be. That must be a heavy burden to carry.
The shock of psychotic behavior can be traumatizing. There is just no talking sense to them. If they are willing and you are able, treatment by professionals in mental health can improve situations in the present. It does not make the pain go away from past trauma, but it can be a new beginning.
Self care is most important when someone confronts a terrible situation that is shocking. I had to take up yoga and exercises to keep some kind of baseline for my own health. For you it might be different, but having a refuge, even going to work, can really make a difference.