Hi patm3300!
I know exactly how do you feel and hope I can help you with my own story.
When I was 17 I have gone through the same.
I was afraid of school because I thought peers would tease me because I am different in some ways from them, I was not able to socialize with them and when I'd try, I didn't know how to behave. And I would seem so weird to them. They'd have a good reason to tease me. Some days I couldn't stay at school anymore, and I didn't go there for 3 weeks (this was on September). Then I changed the school, and even there it was the same. At the end I was not able to stay at school neither for 3 hours. When we'd be free for half an hour, I would go away from there.
When I was younger I had epilepsy and I had been hospitalized for 2 times. Right now, I am less afraid of hospitals like I was some time earlier. I simply tried to forget about what was happening there, and start again from the beginning.
I was afraid to seek help from the psychologist or psychiatrist. And not because of my hospitalization experiences, but because I was afraid they'd tell someone, or they'd not treat me properly.
First time, when it wasn't that worse, I had one psychologist which talked to me like I was total mummy's girl, childish, oppositional and so on...
It was not true. When I became diagnosed with Asperger's she said it's not true, that I'm only manipulating people, I am oppositional and stupid child. She haven't offered any help to me.
I didn't believe there are some good psychologists, but I've found one much better and now I believe them, although not all.
About you, which grade are you exactly, how many time you'r afraid to go to the school, what you are doing about that?
Were you sometimes a victim of bullying and maybe do you know what could be the reason of this?
Hope you'll provide more information, so I could try to give you some advice.
If you are really uncomfortable in that school, why don't you change it? Maybe it could help. Or to seek help about it.
About fear of the hospital, why couldn't you change it? If there are more hospitals, maybe you might change it, 'cause I think it'd be better if you go to some psychologist or psychiatrist. You know, you can always change the professional if you don't like the current one.
Hope you'll feel better soon.
And, yes, Social Anxiety Disorder sucks, just like the other disorders though