Did i have an Allergic reaction?

Today I had a scary incident in school. Here we're my symptoms.

-first I started to get hot and started to sweat a lot

- then my friends noticed my ears were turning really red as well as my face.

- then I started to get a rash on my arms, face, and neck which looked like a bunch of red bumps like hives or chicken pox. Quite small pimple looking things.

- as time progressed it spread throughout my body top to down.

This all happened after I had some coffee with milk and sugar and some caramel flavor shots along with a blueberry poundcake. (I've had blueberries before without issues.) for lunch earlier that day I had a sandwich which consisted of salami, cheese, lettuce, and tomatos(school food).

What I did was go to the bathroom to wash off my face which only helped me cool down. Then I went to a teacher I trusted and i stayed with her until my mother arrived to bring me home. I took a shower and shortly after it died down completely. My mother gave me crackers, jello, apple juice, and apples to help. I got home at around 6:00 and started to rest in bed at around 7.

Anyone know what It could've been or could be leading too?

As of now I'm just very fatigued and kinda dizzy as well, early for me (8:30). Thanks for the help!

PS: I have important tests tomorrow as well as homework today but I feel like I'm about to fall asleep while attempting to study and I can't really interpret the info right. What should I do? My teachers wouldn't really care if I was sick the day before :(