Bizarre. I’m a long-term user of Flovent (fluticasone), which is the steroid in Advair. Advair also has a longer-acting bronchodilator (salmeterol).
Qvar is just a steroid (beclomethasone). I used that (brand name Beclovent) before they discontinued it in favor of Flovent - “shortage of raw materials” but frankly I think it was just that Beclovent was about to go generic. I just did a search and Qvar has been reformulated (to a RediHaler format) - again, almost certainly because the older one was about to go generic and they could market the newer one with a longer patent.
My first thought was that you might have been reacting to the excipients (non-active ingredients) in the inhaler - a quick google suggests that Qvar just has the propellant and ethanol. Advair is a dry powder inhaler that contains lactose.
Thrush can indeed result from use of a steroid inhaler - but your symptoms don’t sound at all like thrush. Even if they were, rinsing your mouth wouldn’t help that since the symptoms are in the breathing passages - which can’t be rinsed easily for fear of drowning yourself!
Honestly, if you feel better without the inhaler, then do without it for a bit. Doctors can be dismissive of medication side effects (my oft-repeated story of a BP medication mimicking worsening GERD; when I finally refused to use the medication any more, my symptoms went away). If the doctor is pushy about it, make him listen to your story. If he won’t, find a new doctor.
When you say the inhalers “opened things up”. what do you mean? Could you breathe somewhat better despite hacking up mucus? Doesn’t sound like it since you say you could barely walk 200 feet.
Some wild speculation:
When I’ve been on oral steroids, I can feel things tightening up as the dose wears off (as I’m tapering to a lower dose, for example). Any chance that what you describe might fit, time-wise, with when you’re getting close to time to take another dose?
And - is it possible that without the inhaler, there’s the same amount of mucus production, but with your breathing passages opened up you are now able to hack it up more easily? (something I experience when recovering from a case of bronchitis: for a few days, I sound worse even though I"m better). Again, with your saying you can barely walk 200 feet, that doesn’t sound like what’s going on.