Hi Cara,
I know you don't want to talk to anyone, but you really should. You mentioned you have special ed teachers so your school should have a support structure in place, use it and ask them to provide someone you can discuss your feelings with.
The feelings of worthless and suicide are a warning sign, your brain is telling you it's serious. If your leg was broken you would go to hospital and get it fixed. Talk to a doctor, or a teacher at the school you trust, but you will be taking a massive step towards feeling better, and I know it's difficult and your legs feel like jelly even thinking about telling someone, but you really have to.
There are some really great people here on WP, stick around and you won't feel so weird anymore, you may even feel normal here, I know I do.