Actually what you're describing could possibly be an allergic reaction.
I had taken Biaxin 4 times with absolutely no problems at all. The 5th time I was prescribed it I started getting strange episodes several hours after taking it that gradually built up. At first I would just feel almost stoned, I'd get slightly sweaty, and the strangest thing of all my pupils would become constricted as if I'd eaten painkillers or something. I definantly felt fucked up.. not in a good way, but not neccesarily bad.
The next day though, the effects were more extreme. It was very unpleasant and I threw up. And again, the truly bizarre thing was my pupils became constricted and I was also itchy, like all the bad effects of taking opitaes. I was over at my girlfriends house and it just happened out of the blue and she asked if I was taking Percocet again, which I hadn't taken nor any other drug in a few weeks. I was also very sweaty this time and felt cold and my skin turned very pale.
The third day all these symptoms became even more extreme and I threw up.. went to the doctors later that day and my symptoms were that of an allergic reaction.
So consider that, but don't neccessarily freak out about it and discontinue taking your antibiotics just yet. Sometimes antibiotics just cause weird sensations anyways. I'm sure you've heard people describing negative symptoms from taking Cipro even though they aren't allergic. Consult your doctor if you're concerned.