Go see a doc now. Brain issues are not something you want to take a chance on. If you have to, go to an ER, they should be able to refer you to the specialist on call for the hospital, especially if it is a decent size hospital. If you can't get to a doc this weekend, I would go first thing on monday morning. Get in touch with the neurologist and tell him what's going on ASAP, he will ultimately be able to tell you if it is something urgent. I'm not trying to scare you, but I know enough Marines and sailors who have gotten combat related brain injuries and not recovered the right way because they didn't get the diagnosis/treatment they needed soon enough. I know that's a very different type of traumatic brain injury, but either way, that's one of the few things you really don't want to put off and take a chance on.

I got a mild concussion from a crash a few years back, and the first two days were a little rough, but everything cleared up pretty quickly after that. I wouldn't be too worried about all of the things you described, if you are taking a decent amount of vicodin, that will certainly make you sleepy and a bit "foggy", that's what it did for me after a surgery I had. But like I said, IMO, it's not worth taking a change.