Hi Momcat7 (do you have 7 kids?) 🙂 The Zyrtec is the HUGE help, the Zantac is secondary in the help department. Please ask your doctor about substituting Neptazane (Methazolamide) for Diamox. I believe that will work for you, but PLEASE CHECK. You have a doc who ENCOURAGES you to bring info? Holy-smoking-cow is that doctor a keeper! And THANK YOU for trying to get those head circumferences for me. Smooch!