DG, I'm sorry you're going through such a tough time. I know what it's like 'cause I'm reliving some of my old trauma. Like, Gee, thanks, Dad!
I would think it's up to the doctor if you get hospitalized again, and not completely your F-parents. Be glad that they care enough to give you the help you need. The quicker you get through this, the quicker you can put it behind you and get on with a healthy life. When this happened to me, I had no one I could turn to.
I'll repeat for you,
It was NOT your fault! It all rests on your dad! Three years isn't nearly long enough. They should keep him for life!
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.