I cough to a point where I vomit a thick mucus......Seems I only vomit from my throat, if there is such a thing, as its not the same as when I'm sick...no burning in my throat. I have not had a cold, so don't think its post nasal drip........The cough seems to come outta nowhere and nothing brings it on. Not worse at nite or when laying down. I've had this cough for 6 months and have mentioned it to my dr. several times. I wanted to get tested for asthma, but he said my chest is clear...Any suggestions?