I have pretty bad allergies, and GERD. I have recently had coughing spells, where I cough and mucus comes up, then it feels as thought my airway is completely closed, barely getting any air down. Lasts about 30-90seconds. Choking, eyes water, can t swallow...etc. Also, I wake up at night from a dead sleep to choking, gasping for air. Feels like thick spit lodged in my throat. VERY unpleasant way of waking up. What causes these episodes? They are very scary!