Maybe it is a drug called Yaba. I heard from yaba from I-doser, which gave it the classification of a hallucinogen. It would explain the slight visuals and mabe even the eight hours you had to endure staying awake. Yaba is a mixture of methamphetamine and caffeine. It is a huge drug in the burma / thailand area but nothing really is documented about useage in Iraq. Yaba usually comes in a smal pill for that looks like a bigger version of a pink colored advil.
I don't know what they are, but I took one too when I was their out at check point 10 in abu ghrab. One of the ICDC monkeys gave me one because I had a bad head ache. he spoke english pretty well I can't remember the name of it. it started with a "b" though. I took it and went back to the tank thinking it was asprin or somthing, but it numbed my toung a little in 10 minuets my headache was gone but I couldn't move iether from the gunners controls. Never again! no small pink pills for me, they probably were colonipin or somthing. may be mercuric chloride for all I know..... I trust him cause he had chewed one up and swallowed it infront of me and he didn't die so I took it.