Sinuses, Sudafed, and Mood Swings

Well.... My sinuses are clogged.... It's not the happiest feeling I've felt, but it's better than what has been going on, so I guess I can't complain that much. It just feels like there's a solid mass of disgusting, super nasty, intensely concentrated brain phlegm or SOMETHING lodged behind my right orbital socket, at pretty much the top left "corner" of it. It's appalling. When I sneeze or blow my nose [unhappily], the pain is comparable to a gigantic needle stabbing into my brain. Anywho, I wouldn't be surprised if I burst a blood vessel in my eye. That would be cool.
In order to attack my sinuses in a not so friendly way, I decided to take some nasty crap medicine which works wonders on colds and congestion, especially in your sinus cavities. I took a normal dose [2 tablets] at about 7:00 a.m., so I would be functional at school that day [because apparently I had to go...].
As I found out from our school nurse, medications like that hit their peak of effectiveness after about 6 hours of ingestion. During AP History [5th hour] I was wired! Wired as in moodswingish, paranoid, hyperactive, spacey, and aggressive. How lame is that? I.E. I was sitting in my desk as my teacher droned on and on about the Jeffersonian Era [which I could care less about] and my friend sitting in the desk in between the heater and me started to look at me funny. I didn't know this because I was too busy thinking about Pac Man and looking angry. I noticed the tapping coming from the heater only moments later, when I furiously looked over at her with a glare that would have stopped blood flow if it wanted to.
In my head it all made perfect sense. She was kicking the heater. Of course! That makes complete sense!!! The quietest girl in the entire class suddenly decided to make a helluva racket. Right. As I was glaring at her, I was thinking "WHY is she doing that? That's ridiculous! I was becoming SO angry it was scaring me! Then I realized that she wouldn't do that, and I felt completely stupid.
After about 2 more hours of ridiculous mood swings, I'm happy to report that I was back to [my] normal. Note to self: No more Sudafed before 10:00 a.m. Cheers!