What are my chickens sick with?

[MiniMorbid]

I’m finding several diseases with the same symptoms listed, can y’all help me narrow down what they have so I can treat appropriately?
Sneezing, head shaking, runny watery brown poops that are very smelly, puffy eyes and seemingly redder in the face in one of them.
I noticed sneezing yesterday, diarrhea last night and the change in face just now. They’re almost 14 weeks old.

 

[azygous]

Amazingly good rundown of the symptoms. It sounds like it could be a serious case of Mycoplasma, a very common respiratory disease. The treatment would be Tylan 50 or Tylosin powder, available online if you are not in a western state with laws against it.

 

[MiniMorbid]

Amazingly good rundown of the symptoms. It sounds like it could be a serious case of Mycoplasma, a very common respiratory disease. The treatment would be Tylan 50 or Tylosin powder, available online if you are not in a western state with laws against it.

Thank you!! I will get some ASAP. I feel so bad.