My Sebrights starting sneezing with runny noses about a month ago. Plus they were gurgling a little. I thought it could have just been the quick temperature change here, but now the worst one even has some eye excretions. Now there are a lot of my large fowl that are sneezing with runny noses! Heeding the only advice I've gotten on here so far, I put minerals, electrolytes, vitamins, and ACV in their water every day for about a week now. I haven't noticed any differences. The original Sebright that is doing all the gargling and has the eye secretions didn't look all that good this morning. I threw the food int he run for them to scratch through, and he kind of moved in slow motion, while others pecked at him and his wings were drooping. I picked him up and he bit my glove, then if I moved my hand a tiny bit, he would try to catch his balance with his wings. What should I do now?? Antibiotics? Corid? Worming (again for some)? I'm just so lost and I don't think this is just a cold like I was hoping. I've invested so much into this flock and I would be very sad to lose them. PLEASE HELP!!!