Hang in there, you're doing everything you can. Fortunately we all are able to learn from each others losses, so hopefully there aren't any more or at least fewer. I hope you don't lose anymore, it's hard feeling that helpless. I lost two juveniles (10-12 weeks old) in the last 2 weeks, I've got about 10 chicks/chickens on antibiotics for who knows what. I'm just doing my best & that's all any of us can do, so breath in & breath out & repeat, and now don't beat yourself up regardless of what the outcome is.