I started shaking in school. So scared

I was sitting being normal. No drugs or anything. I woke up got ready, then by sixth period I was just watching reels being as calm as can be before this sudden nausea hit me. I ran to the bathroom to dry heave once and I felt a little better ( I think there was gas build up in my chest or something ). I sat down to regain my wits and then suddenly this terrible shaking happened. My whole body was trembling, my jaw was uncontrollably shaking and I could barely type a sentence. I went to the nurse, laid down, and continued to shake. They made me do breathing exercises and it helped a little. It was only until I was getting driven home and closed my eyes did I feel better. My counselors said they thought it was a panic attack and I don’t know for sure. I was so chill and calm, I was not stressed