My Chicken has shown some weird issues.

[Akisha Haque]

Hi I have a road island chicken and she is 5 years old. Today she’s been acting weird and keeps sneezing or coughing. She was eating some clovers from our backyard and vomit they out. I put some antibiotics in their feed and vitamins in their waters for now but I don’t know what’s happening. Please help me, I don’t want to lose her.

(This is a video of her condition that I took today, please take a look this is my first time)