Psychic Experience At School

I've known I was a psychic for a very long time, but this particular experience was just weird. It started last night. That night I was having strange dreams that did not make sense in the slightest. I just brushed it off and went to school normally. The first hour of school was normal in every way, but something just felt "off". It was like a feeling that something was going to happen, but I had no idea what. When I got to gym class is when everything became weird. We did our cardio workout as usual, but after that, strange things happened. People were getting dizzy and feeling sick while getting tingly hands at roughly the same time. They all had the same symptoms, and one girl even fell face first into the floor because of the sudden dizziness. Weirdy, while this event was happening, I suddenly heard a voice in my head that said "Be ready for tomorrow." I have no idea what this means, and it's a big mystery to the teachers as well. Weirdly, after this whole ordeal the people who were sent to the nurse were all better suddenly and there was no problems at all throughout the afternoon. Does anyone have any idea what this could mean? Teachers thought it could be a leak of pool chemicals, but they checked and everything was fine. The teachers are saying that the people who got "sick" have something in common but none of us know what. The same thing occurred yesterday as well at roughly the same time. I really want to know what this could mean. Also, could the voice be an example of precognition? I'm known for a good intuition but this "warning" seemed pretty clear. Do the random dreams have anything to do with what caused the occurrence? My parents also reported weird dreams, and my mother also felt dizzy/sick around the same time the ordeal occurred at the school. Help would be appreciated. Thanks