I have been on Biaxin XL 500mg tablets for 8 days now, and I just finished 6 days of a light form of Prenisone for a lingering sinus infection. (I've had it since Memorial day!). Since I stopped the Prednisone, I am feeling really yucky again. MAJOR headaches (when I rarely get any....even WITH a sinus infection!), ear pain, sore throat, stomach upset (this just started this AM, and I have been taking probiotics), and nausea, as well as metal mouth taste. I have already done 2 full rounds of Amoxicillian, Augmentin, and Levaquin. I just called and told them I couldn't take being sick anymore, so they are finally going to do a CAT scan and allergy testing. I really don't want to switch antibiotics again. Should I tough it out and see what the tests say, or call them and say I need off of it?