My father is 86 years old. For a number of months he has been complaining of severe constipation, he says he has to get up 6 or 7 times every night to visit the bathroom. He says his stool is so hard that he has to strain enormously but often with no result. He has been examined a number of times by different doctors who have carried out tests as well and reassured us that he has no constipation. It seems that he has an obsession that he has not emptied his bowels and repeatedly feels the need to sit on the toilet seat. A number of medications treating his constipation have been tried. We have finally concurred with the doctors that there is really no constipation. we have tried explaining this to him but he is convinced otherwise. we are looking for any helpful suggestions to deal with this situation, thank you.