Coughing from CPAP...

Ever since I started using my CPAP machine, I am very sensitive to cold drinks and foods and also dairy, they make me cough up mucus and wheeze. It seems like my lungs and throat are very irritated from using my CPAP and are ultra sensitive. I am also wondering if I now have asthma, My doctor treated me for acid reflux and I took Prilosec for a while but I am realizing that my cough and irritation is more related to some sort of asthmatic reaction. Has this happened to anyone else?

Sometimes the humidity can be an issue for your sinuses and cause post nasal drip and coughing like that. Try lowering the humidity setting and try that for a few nights.

More likely, you are swallowing air that is exacerbating your reflux and GERD. That may mean backing down the pressure and increasing it more gradually, or increasing the pressure relief settings on your machine, or learning to sleep with your tongue in the right position to avoid swallowing air (on the roof of the mouth, on that ridge behind the top teeth--practice all day until it's habit and it may carry over at night).

Asthma, sleep apnea, and reflux all go together. It's unlikely CPAP caused one or the other, but they may be more apparent because of it. It takes some tweaking to reduce these issues, stopping CPAP is not an option.

I tend to develop a bit of a cough when using my travel machine. No humidity with it. I would say that getting your humidity settings correct might be a big help. I have the ResMed machine with heated hose, that helps with "rainout" should that be a problem.

I have asthma, and in the last few months I had developed a severe post nasal drip, and a chronic cough.
I have experimented with lowered humidity settings. I was previously on "4", and I've tested lower settings including "off" to only get pass over humidity.
I've settled on "1" for now, and the cough and post nasal drip are almost totally gone now.

Maybe GERD? [[[or worse]]]
See your doctor.

Once breathing is fixed, the brain tends to do a self-search to figure out what else may be disturbing its sleep. Post nasal drip can be one of its finds.

PAP itself need not be blamed directly, since positive pressure isn't really what causes the issue. But a new upper-airway environment IS caused by a mask, since it has to vent to blow off breathed air. That makes humidity a larger factor than it would be without PAP, for many. Getting humidity right can be a real trick worth working at.

Irritation of the lungs is sometimes a leftover issue from untreated OSA having pumped stomach fluids up into the throat for years. But any serious feelings of 'lung irritation' that last a significant amount of time need to be assessed medically to rule out highly-significant conditions.