Please help him with sudden gasping and wheezing. Possible stridor or respiratory infection?

[Helens_Hens]

I have a 3-year-old buff orpington who just literally developed symptoms she was eating just fine and playing with her sisters right before I noticed this then when she was done eating she was in the coop on the roost and I heard her wheezing she was not doing that previously this is all onset within about 20 minutes no other chickens are showing any symptoms similar she's the only one which leads me to believe it could be possibly stridor but she is sneezing as you can see in the video no bubbles in the eyes or watery eyes but when she sneezes there is quite a bit of fluid that she's sneezing out is it possibly an allergen? I did put herbs and some red pepper in their feed it was wet feet it was not dry feet but is possible that it could have been the herbs that I put in there or the pepper maybe an allergic reaction to something?
I just don't want to lose her and this is something I haven't dealt with before even though we've had chickens for years.

 

[Susan Skylark]

Stridor is simply a term for noisy respiratory sounds associated with a narrowing or partial obstruction of the upper respiratory tract (face, sinuses, etc). A physical irritant could certainly cause issues (your red pepper certainly, especially if ingested or exposed to mucus membranes in any quantity). Flushing affected areas with water (encourage her to drink, gently rinse eyes/nostrils or wipe with a damp rag) may help. A little benedryl wont hurt either. Otherwise just give her some time, if she’s better in an hour there’s your answer and next time go easy on the herbs

 

[Eggcessive]

Let us know if she is still having any stridor or sneezing in the morning. Have you added any new birds recently? Note if there is any bubbles or foam in either eye, or if she is swallowing mucus in her beak frequently.