I have coughing and breathing issues after I take a sip of liquid. I just had an episode that lasted about 15-20 minutes. My wife helped by pounding on my back, I could not breathe and turned a very dark purple, eyes became glazed. I was able to cough up clear mucus but it lasted so long that my wife wanted to call 911. Could I have problems with the flap(value) not getting the right signals when I swallow. This has happened three times in the last 4 weeks, following an episode of pneumonia.