I recently got a total knee replacement and was given hydrocodone for pain relief, Within a week, I was rushed to the emergency room when I could'nt breathe. Had a whole battery of tests, but they found no specific reason for the episode. Exactly one week later, suffered another episode. Again, sevderal tests at emergencyand one Dr. suggested it might be swollen vocal chords causing the problem. He referred me to the ear nose and throat specialist who found nothinhg specific. He guessed at acid reflex but didn't really have any specific ideas on why this was happening. None of the Experts ever even offered a suggestion that it might be the Hydrocodone. Has anyone else had similar problems and are there any other pain killers that might not have this side effect.