Anyone baby have a chronic cough that never goes away? I’m quite stressed that nothing seems to work.

From 6 months my baby has been sick non stop as soon as he started daycare but there has been this cough that comes and goes and now it’s back where he coughs in his sleep and while he eats. He vomits sometimes because the cough is so harsh.

I just want to fix him. He’s on antibiotics right now. Maybe the 7 round in his short little life . Got a humidifier. Nebulizer, nothing seems to work.

Anyone gone through this and found a fix? .