Please helps what's wrong with me?

(I'm a 14 year old girl for starters, and healthy...103 pounds). Okay so literally 10 minutes ago I was in my last class of the day and five minutes before we were about to leave I felt extremely confused, like I was dreaming. Every sound made me feel like I was asleep. I started shaking and getting light headed, also hot. Then the bell rings and I leave, then tell my friend and I started feeling better. Now I just feel skaky sweaty and cold from what happened. For the past two weeks I have been having gas problems, where I always feel like I have to fart and poop. Today is the 5th day of my period and it's practically over so I doubt my dizziness is from that. Maybe my dizziness came from sitting next to a really hot guy in my last class because I get really nervous around him, and I get nervous that i accidentally farted because of my gasp problem, so maybe it's from that. Who knows. Also, whenever I think about being dizzy, I get dizzy. I dont know what to do. I'm not going to school tomorrow because it's my last day before spring break and I'm too nervous that if i go I will feel dizzy again. Do you guys think this was from nervousness? Cause i felt normal again after I was out side and around my friends. Im fine now but still kind of shaky and warm after what happened. Maybe I have anxiety? Idk. Someone help :(