hallucinating question- something to worry about?!

Hi, im a boy, and im 15 years of age and while in school I experienced some sort of medical condition. You see, my day was very stressful to begin with and I wasn't feeling well so maybe this played a roll in what im about to tell you. In chorus class we were singing, and all of a sudden I got really light headed. And I swore I saw my crush (which is another boy... yes. I am bi thank you very much) singing with us on the risers. I was so confused, and I was 100% sure that was him up there with us. Its not like I could just walk up to him and ask him what he was doing here I was on the other side of the risers. So I tried to get his attention but he wouldn't look at me. So, my friend Amanda, who was standing next to me... I asked her what he was doing here and she literally looked at me like I was nuts. I pointed him out and she was like "what the f*** are you talking about? hes not even in the room!" Then I start to black out for a couple seconds and when I looked back he wasn't there. this may seem like a bull crap story but I'm actually scared right now, was I hallucinating? Is there something wrong with me mentally or what? This really freaked me out, I actually started to cry a little because I didn't know what was happening