I will presume we all have this but please tell me if you do or not.But do you get IBS hangovers, when you drink you dehydrate yourself and likewise when you have D you dehydrate yourself and that leads to a splitting headache.normally just drinking lots helps reduce the time I have this but today it wont go away.I know on packets of Immodium it says this is not a substitute for rehydration therapy but I have never really looked into if what rehydration therapy is and if it helps people like ourselves.Tried to google it but just keeps talking about africa anyone know any better?