I'm sorry you have had to experience those things. I know when I read them they brought up so many different feelings and I found myself in a place where I wasn't sure what to say or how to respond. I'm sorry.
I know you would like some feedback. Maybe some validation for you feelings? I know I've posted things in the past and then felt badly when no one replied, but I found out later that many had read it and it impacted them deeply and they just didn't know what to say or how to responde. I'll do my best here.
I can see these. I hate hospitals. I hate tests, and being young and dealing with all this mess, yes I can understand the fear, and the anger. You have a right to be angry, and it's ok to be afraid. I'm afraid a lot anymore it seems.
I think the good things I see here are the support from you nana and your dad. That is awesome. I wish I'd had such things at your age. Cherish them.
I'm also enheartened by the fact that you finish it with:
Those are good things. Positive things despite all the crap you've had to go through. I'm sorry that you've seen too much. You shouldn't have to feel and know these things. But you're doing the right thing by fighting, and recovering, and surviving, despite the things in your past.
Don't give up! Keep fighting!