My 5 months old Silky doesn't feel. It started about 4 days ago. It began with him having a little unbalanced problem. He was alert, eating and drinking well. When feeding him treats, like if he had vision problems, he couldn't reach for the food, peeking just beside it. I gave him vitamin E, plus Tylan just in case he would have a secondary infection (I have a flu problem with my flock) for 3 days. No sneezing, no sign of respiratory problem. Today, he stand still, with discharge from his left eye and nostril. I put Erythromycin in his eye a couple of hours ago and now, it is very swolen. His mouth seems ok, with only a little white spot on his palate. Someone has an idea on what's going on with him?