Help diagnosing struggling chick!

[TNatty]

I bought 6 little Americaunas yesterday and one immediately seemed to be struggling with constant chirping with each breath sound, clicking and mouth breathing. I went back to the store and explained the problem and the sales guy acted like I was accusing him of selling bad chickens. I just want to know how to help the little fella. She is so precious. I went back again thus morning and another sales person suggested Wazine for parasites. I put a small amount in the water but she is really struggling. I'm new to this and would appreciate any suggestions. She seems to do a little better if I cup her in my hand and hold her next to me but is still obviously in distress.

 

[TNatty]

Asked several locals and they had never seen one act like this but the sweet little girl seems to be fine now. Held her for several hours so she could rest and sleep, then hand fed her and watered. Perked up after she pooped and seems to be fine now. Squawked loud when first pooping but now fine.