 [ Symptoms ] how 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 not 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 [ Disease ] 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