Not sure which diagnosis I prefer.
Really? Silent reflux isn’t a big deal. I was diagnosed with it fairly recently, just by symptoms no camera required, I found some of symptoms such as the constant feeling of something in my throat and slight problem swallowing quite worrying for an ex-smoker, it was a huge relief when it responded to reflux treatment.
I can’t remember what I was given, some sort of antacid, it resolved the problem very quickly and to my surprise permanently.
I believe that a hiatus hernia is often the cause and I don’t think that can be fully rectified without delicate surgery.
If you are overweight losing weight may cure it.
Edit : Phlegm was an issue so I can see why it might be misdiagnosed as asthma.