I was thinking more of your situation. Again, I don't know the doctor you speak of, so could be wrong.
Normally, doctors I've seen who've tried to decrease my controllers do it gradually. So, I'm on Advair 500/50. They might try to do Advair 250/50 or FloVent 220 instead-basically the next step down. If he's trying to take you from something like Advair 500/50 to no controller medicine, that just sounds off to me. Also, when he says that asthmatics on Advair still wheeze, that's not been my experience. I do well about 75% of the time and the other 25% I have some type of symptoms requiring frequent use of rescue meds. However, during that 75% of the time there are no symptoms-no wheezing or anything. I do notice a great improvement with the Advair. So, he's wrong in that the majority of the time I don't wheeze with Advair. I only do that during the 25% of the time when I'm in an exacerbation.
Even before I was on controllers, when the PCP would listen to my lungs if I wasn't having an attack right then and there I was clear to ausculation. However, if I was having an attack, they would hear a lot of coughing with fluid coming up and see my chest wall going in and out uncontrollably and see retractions. I don't know for sure if they ever heard wheezing, but they would notice I could only say one or two words at a time and was using my neck muscles to breath. Between attacks, though, I am clear to ausculation even when I'm having attacks every day.
So, I don't know if he's a PCP or what his training is. I also don't know if he's trying to get you on another controller drug instead. I know you say you don't have the money to see someone else, but you might want to try if you end up having the money, especially if he's taking you from Advair 500/50 to no controller at all. But again, I don't know all the information of what happened, so I could be wrong.
Asking him for a plan if you destabilize is the only other things I can think of doing so even if your asthma does get worse, at least you won't die.