My aching head

I had a little bit of a sore throat yesterday, and today I woke up with a headache and messed up sinuses.

One of my coworkers gave me something to take, and I didn't bother looking at what it was (typical nurse), and now I'm all spacy. This is not necessarily bad, but I am supposed to teach advanced life support in about an hour, and I can't quite focus. I wonder what that stuff was?