 [ Symptoms ] how quickly can one get diarrhea after eating  my spouse says that if i have diarrhea i should try to recall what i ate the day before i think one can get diarrhea the same day within hours or even minutes after eating something that does not agree with me thank you [ Disease ] if the cough is caused by post nasal drainage from your sinusitis you can try taking a long acting antihistamine claritin or zyrtec to dry up some of the drainage cough can also be triggered by simple irriation so a teaspoonful of honey or glycerine based cough drops may help drink plenty of fluids and humidify the air you breathe at night humidifier or vaporizer if all fails you can try an otc cough suppressant like delsym or ask your medical provider for a prescription cough medication primarily at night