Whats wrong with me ;//?

I was sitting in my 1st hour history and I started to feel really sick to my stomach..I layed my head down and tryed to wait it off..about 15 minutes later..I got super dizzy and my arm started twitching/sshaking un controllabley..I didn't want to ask my teacher if I could go to the office because this happens often and normaly it goes away..well the bell rang..I went to 2nt hour english..I was having trouble breathing and I kept holding my breath and it felt like I was choking..I asked to go to the library and get a book..she said yes..I went in and paced for about 10 minutes then my legs went weak..I struggled to get myself to a corrner..I sat down..my heart was beating 100% faster then normal..I was dizzy,super nauseated,trouble breathing,and shaking like crazy..the mean librarian saw me and yelled at me to get back to cl..I got up shaking..hardly able to stand..carefully walked back to cl..sat down..my english teacher yelled at me for not having a book and made me stay after the bell..so after everyone was out she came over and I wasent able to answer because the overwelming heart speed..but I innteruted her with "im gonna p out"..she called the office..people came in..and then everything went black..I woke up at home in my bed..still dizzy..im really scared what this is..I haven't ate at all to day but I had a natural can of fruit juice this morning..(I normally don't eat breakfast)..im only 13..never ually active..I didn't take any pills..should I go to school tomarrow? I can't go to the doctor..we don't have that kind of money..help ;/