When I was a kid I was wrongly diagnosed with asthma...when I had GERD... (the asthma didnt show up til later years, lol). I was given inhalers...
The reason this happens, in my understanding, is because people with GERD commonly aspirate (inhale) acid, thus causing coughing and asthma-like symptoms. In one manner of thinking you could say it causes a type of asthma...where an outside irritant causes asthma.
The asthma meds never made the reflux worse. It just did nothing for the reflux...thus leaving my lungs still irritated from aspiration.