@Cynthia777, I have posted several times about it on the apnea forum, and have been reading on other forums, and just today got a reply that I think is super-helpful. It turns out that humidity that is too high can trigger asthma episodes, just like humidity that is too low. Optimum range is 35 - 50% humidity, and I was getting more than that from the machine. So my plan is to get healthy, and then to try the machine again, this time with humidity on manual so I can set a lower setting. Perhaps using that strategy won't trigger these symptoms in future.
No, it couldn't have been a coincidence, because I have not wheezed, even once, in over two years. Even when I was so sick with the sinusitis last February, and I was coughing and really ill with respiratory symptoms, I never wheezed once, and chest was completely clear of worrying sounds. And this started on the morning after the first CPAP use.
So glad that I maybe have an answer! Once again, self-diagnosis, and only help from doctor is to treat symptoms. Am so grateful we have online forums and Dr. Google to consult.