Just want to pipe in for a sec… I can imagine that the whole process might feel overwhelming, and that this might add to your feelings of powerlessness and frustration.
And, that maybe the document hunting, phone calls, etc, might feel especially hard on a day you maybe woke up feeling bad. (Or were made to feel bad.)
But please don’t give up! You’ve got to fight for your health. It saddens many of us here, I think, that this is true. But now, you have to focus on the fight.
Could you set aside an hour a day to make calls, fill in forms, etc? Might be easier to cope - and focus on the fight, not the fact that it’s unfair - if you decide in advance that that hour is just there. And accept that the work will be boring and fussy. And then just agree with yourself that you’ll spend that boring, fussy hour dotting whatever i’s need dotting, and crossing whichever t’s need crossing.
And fight to get the information you need from your dad. Cajole him; annoy him; cook him dinner every night if you have to - whatever it takes. Just get those papers, they’re your ticket out. Once your health is addressed, other things will follow.
You can do this!