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breathing issues?

Over the past month i have had on and off breathing difficulties.  i suffer from chronic moderate sinusitis.  so I am a big mouth breather.  I worry its my heart but i have had that checked with a treadmill stress test a year ago and was ok. Had an EKG a month ago and that was OK.  i did have bad bronchitis a couple years ago but cannot figure with my breathing is labored on and off?  any suggestions

Update:

Also, i do not have a cough or fever

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