I was showering once, blew my nose in there, and - diagnosed a bad sinus infection. Seriously - a three layer parfait of grossness. How bad was it? I made an appointment to see a physician (or physician's assistant, based on the clinic our insurance used) and told the guy what had happened. By the time I got through describing the second layer, his face was greenish and he was typing a prescription on the office screen. I still described layer number three. He was a bit greener of face by the time I left, but he tried playing it off by telling me to bring in a sample "next time".
So, I blew my nose on the way to the appointment & had a clean white tissue full of the results. He never again asked me to PROVE that I had a sinus infection like that. If I said that I had one, I got the prescription.
I also proved to more than one medical provider that I can diagnose myself with strep throat, as there is a distinctive taste to it. Turned out my daughter might have been a carrier...between the two of us, there were school years when the only thing keeping strep at bay was running everything through the dishwasher, even toothbrushes.
I know I'm over a year late here (haven't checked this group in awhile), but have you tried Mucinex? Guaifenesin.
I used to get 6-7 sinus infections a year, to the point where my sinuses were actually calloused (6 CT scans showed that), and I worried about developing a resistance to common antibiotics. One ENT doctor prescribed guaifenesin, before it became an OTC med. Never again. I'm not kidding. Not a single sinus infection in over 10 years, thanks to this miraculous now-OTC med. I don't take it every day anymore, but anytime my sinuses start to clog up (usually creating the inevitable sinus headache), I take it, and voila, it's gone. Kaput. Nose runs, no infection. No antibiotics.
It's a very mild drug that doesn't seem to react or bother any of my other many many meds, so it's okay for me. I know that some people don't react well to it, and some have adverse effects, but overall, it's been excellent for me.
Mucinex is the brand name and it's very expensive. Guaifenesin is the generic, considerably cheaper version.