Is it possible to have relatively clear lungs and be coughing until you are gagging?

Hi RMHannah, and thanks for your post. You may be aware, we cannot provide medical advice or diagnostics over the internet (for your own safety), however, your concern certainly warrants a reply. Asthma symptoms can vary from patient to patient and so, your situation may be unique for you. There are people who have an asthma diagnosis and yet, do not wheeze. I thought this article might provide you with some additional insight. https://asthma.net/living/silent-asthma-what-you-need-to-know/.
I do hope you find these articles to be helpful.
Wishing you well, Leon (site moderator)

Yes you can have cough variant asthma which is a cough with phlegm but no wheezing. This is my diagnosis. But it’s important that you see a pulmonologist to get a accurate diagnosis.