You could have Giant Capillary Conjunctivitis. I wore contacts w/o any probs for years, and then I noticed they got more and more uncomfortable over time. It grew so bad that I went to two diff eye drs who scratched their heads and gave me samples of every possible contact lenses out there--each time I put them in and within hours they'd be fogged up, just as you described. In desperation (I was wearing glasses full time at this point, and NOT liking it), I went for a free LASIK consultation. I explained my history and the opthamologist said, "I'm gonna diagnose you right this instant." He flipped my upper eyelids around a small stick and said, "Yep, you have GPC!" In my case I had given myself an allergy to the thimerisol over time--an "exposure" allergy, they call it. So yes, you can totally be allergic to contacts--not the lens itself, but all the liquid it is bathed in. The only solution for a bad case of GPS is to never wear contacts again. I got laser eye surgery (had PRK, the old style surgery rather than LASIK, but that's another story) and I have been RIDICULOUSLY HAPPY about i! No more glasses getting rained on (hello, I live in Oregon), no more calling hey kitty kitty to a possum, which I did once, no more bar across the side of my head while trying to lay down and watch TV. Totally. worth. every. penny. Good luck to you. Hope this post helps.