Has anyone experienced similar symptoms...sometimes I experience almost a shortness of breath where it feels like I'm forcing out a short exhale and then an involuntary cough. I also seem to notice my heart seems to be beating a bit faster. It's the strangest feeling of being forced to cough and creates almost an un-nerving feeling - as if I've had way too much caffeine. Does anyone know what this is? I plan on going to a pulminary/respiratory doctor just in case to have it checked.