I have really bad problems with school every time I go I start feeling sick sometimes I am sick and sometimes it makes me go to the bathroom. I get really nervous in large crowds of people I start feeling dizzy and very unwell. I also hardly get taught anything there the teachers don't do a good job at all. What would be the best thing to do?

Talk to your doctor. It sounds like your having anxiety issues and they may be able to recomend something. Also avoid caffine drinks like red bull or other energy drinks.

I agree with Cdad, it sounds like you have anxiety issues. Is there something going on at school to cause these issues? Therapy would be something to look into.