I have been on a cpap machine foe about 4 months, since then I have had bronchitis once and a severe flu-like infection 2 times in 7 weeks, I have a persistant cough now,that I have had since the last episode. Sometimes the coughing gets so bad I get dizzy, alot of the time I bring nothing up, but other times I bring up clear flim. Could this be caused by the cpap machine?