### Human:\nhow to prevent postnasal drip that drains into stomach and makes me vomit every morning. every morning i have to vomit! it is very very frustrating because i can't do anything until i throw up. after that i am fine! i also have a cough that creates i see mucus and brownish yellow bile like substance. has anyone heard of or had this problem?\n\n### Assistant: one can control post-nasal drainage by using an antihistamine but i do not know anything about you or your medical history to know if this would be recommended for you since the underlying cause has not been determined. the brownish mucous is a a concern and could indicate a sinus infection so it would be wise for you to see your medical provider so you can be properly examined diagnosed and treated.