Hello, I have really awful allergic asthma and I'm on Advair 500, Singular, Zyrtec, Xolair and I'm getting immunotherapy allergy shots, but I'm still having a really bad time of it. My Albuterol no longer helps at all (I hardly ever take it anymore). I've tried maxair too and this does not work. I don't know what else to do. Any suggestions for rescue inhalers? I'm feeling at the end of my tether.