I use the same azelastine as you do.
As for the sinus rinse, since I don't use any meds in it, the small aerosol bottles of saline work for me - no boiling, cleaning, rinsing and sterilizing...
Is your problem primarily in your sinuses? If not, you might want to ask about Symbicort (or generic) inhaler - budosenide plus formoterol (long acting version of albuterol-type meds) that will get more med into your lungs.
Also, with a flare-up, has your ENT done any culture of sinus or sputum to see exactly where you are infected, and with what bacteria? And if you are feeling unwell, are you sterilizing your Neti Pot after using it a few times?
Sue