This past week while flying from Ohio to Arizona (including one layover), I developed a ridiculously persistent and totally nonproductive cough during the flight. During the past four full days that I ve been in Sedona, Arizona--and meanwhile taking regular doses of Maximum-Strength Mucinex Fast-Max Clear & Cool for Cold, Flu, & Sore Throat , whose Ingredients are Acetaminophen (pain reliever, fever reducer), Dextromethorphan (cough suppressant), Guaifenesin (Expectorant), and Phenylephrine HCL (nasal decongestant)--my cough has become almost constant, yielding some phlegm but not a ton. Would my healing likely be worsened by my taking a daylong train excursion tomorrow to the Grand Canyon and back?