Retorical question: What does one thing have to do with the other as far as your dad is concerned?
Suppose maybe you confronted him at the wrong time? If he's upset with you because he thinks you mismanaged his affairs, his mind won't make room for your problems, Hon.
You can see the outward, physical symptoms of his stroke. What you don't know is what happened in his memory.
What you need to do now is tell yourself that you did the best that you could as far as your dad is concerned. Can't say that I would have done anything different of the things that you have posted. Is he back home yet? If not, then maybe he's too upset with you still because you put him in a rehab hospital. They get that way, you know... really unreasonable!
Just take care of you, Hon. Give yourself possitive strokes and affirmations. If you did make mistakes it was because you've never gone through something so difficult before. I still wish I'd done things differently with my mom. It does no good to beat yourself up for it. The bell can't be unrung. What happened, happend. Forgive yourself and then be gentle with yourself. You know you did the best you knew how at the time. You can't ask any more of yourself than that.
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.