I'm dealing with chronic urticaria and have tried different antihistamines like Cetirizine, Fexofenadine, Desloratadine, and Levocetirizine, but they all cause me severe heartburn and acid reflux. I noticed that when I take Monlevo, which combines Montelukast Sodium and Levocetirizine Hydrochloride, I don't experience these side effects. Why do you think that is? Is there something about this combination that prevents the usual issues? What should I consider or discuss with my doctor about this?