ok I will pics this afternoon or tomorrow
right off from what you already said, I'm betting it's MG. If you have a avian vet or an NPIP Testing Lab near you, I'd be taking them to get checked. We can all guess. Fact is there are lots of respiratory problems they can get though MG and MS are the most common this time of year. Problem with most of them is the symptoms get better, but the bird will always be a carrier of it from then on. While they arent overly deadly, those 2 spread like wild fire in a closed flock because the dander can spread the "bugs" from pen to pen in the air. Isolate those 2 asap. MG can only live outside a host for 3 days. So after then if the others are fine, you should be ok with them. If they test positive for it, they will always have it, so those shouldn't be reintroduced to the flock if the rest of your flock test negative.... in short you know they'd have to go. Many people have it and just dont care, but if you plan to show, breed and sell etc, it's not a good idea to keep birds with it. Like I said, they recover just fine, but any time they go threw a period of stress, temp changes do it a lot, it will pop right back up. This is why you see so many people on here this time of year with the same symptoms, the cold stress brings it back out.
I hope that isnt it, but I bet it is based off time of year and the commonness of it. Any oxytetracycline based drug helps treat the symptoms of MG and MS. Tylan also helps. Theres a wide range of stuff that works, but again none of them "cure" it they treat the symptoms and help fight off secondary infections til it gets better. If you do test positive treat for 2 weeks in most cases if you decide to keep them.
Again this is all based of the most common cause, MG... I hope it's not it, but to know for sure you'll need to have some lab test done. If you dont know where to go, check the USDA APHSI website. They''l show a list of agencies in your state that can help. Also many local vets cant send off blood work for you too. Just call around and ask them, I'm sure one will be able to point you in the right direction.
Back in the day I had no idea we even had such places, more I dug around they are scattered all over the state here.
Good luck with it, hoping for the best for you, but do get some lab work done, in our state it's all free, and you know exactly what you are dealing with then