I was treated last month for a sinus infection. (I have lots of sinus infections, have had surgery on my sinuses, etc.) Doc gave me a z-pack and prednisone. Suggested I try Claritin or zyrtec to see if allergies are triggering all of this. Claritin is helping a lot with the post nasal drip, but now the junk in my chest seems tight and I have a dry, unproductive cough. Should I try mucinex to loosen up the chest and continue with Claritin?