I was in a deep sleep, and woke up choking. I coughed up stomach acid from my airway. I was having trouble getting air in my airway because of the stomach acid. I'm still having intense burning in my throat and all up and down my esophagus. I am very weak, and cannot get a deep breath without coughing. This has happened 3 or 4 times before. I take 20 mg omeprazole 2 times a day. Are there tests my dr. should perform to see if my esophagus is damaged? What can my dr. do to prevent this from happening again?