You are doing a great job balancing your own needs with his and setting reasonable boundaries.
I think when this is all over you will be glad you did what you could while still maintaining the limits you need. I feel sorry for your father. We don't know what trauma he experienced as an infant or child... I can feel compassion for that hurt little one without feeling a moral obligation to sacrifice too much. Again, I love how well you are balancing self-care with caring for your father.
Much love sent your way.