For those of you who have dealt with sinus infections (my peas have never had one that I've seen), what were the first things you noticed? One of my peas is tending to keep one eye closed -- but is still using it -- and there doesn't seem to be anything wrong with it. There's no swelling that I can see, nothing different on that side of his head from the other one, no discharge, he just keeps closing that one eye more of the time. I wondered if it could be the sun, but it is not dependent on direction or sunlight. I sat out there for probably 20 minutes yesterday, and heard what may have been one, very soft sneeze in that entire time. Otherwise, he acts completely normal. But this eye closing thing has been going on at least two days. That's weird, and not normal. I am suspecting very early stages of a sinus infection. Thoughts?