Thanks for the replies.
I have racked my brain trying to think of something, anything, new that might have been a trigger for this. Can't think of anything. We don't smoke, which the vet said was a big problem for alot of cats, no new rugs, carpets or furniture. I haven't even changed launrdy detergents. I do burn candles occasionally, but not in the summer and this has been going on since July or possibly longer. One think I have thought of is that I switched litter brands earlier this year. Went from using Scoop Away to Wal-Mart Special Kitty Scoopable.....hmmm, I wonder.

The Chlorpheniramine has been keeping the sneezing/coughing at a minimum, but his one eye is terribly red with lots of filmy stuff all over it. I've been wiping it out with a cotton ball warmed with water. I'm calling the vet again tomorrow. Just don't know what else to do. I might try Scoop Away again and see if that makes a difference.....