My chickens have recently been sneezing & having snotty noses. So, we have been treating them with Tylan 50 injectable. Today will make day 3 of treating them. Everyone was improving until I got home from work & now 1 of the chickens has a nasty gooey, swollen, oozing eye. She also has yellow gunk coming out of her nose. This is NOTHING like what my other chickens have had & she has been getting treated, too! What do I do? Please help! Its gonna break my heart to lose one.