It sounds like your chicken has a full crop. The congestion could be from the hot weather. It happened to my chicken a few weeks ago. She had trouble breathing. I brought her into the house since I have AC. Eventually I brought in a cage and had her stay on the kitchen floor where it was cool. I gave her water, chick starter and some yogurt. Eventually she started eating and was fine the next day. She has been great ever since. She still thanks me
