I have been where you are with the constipation and I know how aweful it can be. I have had time where I didn't go for a week!
I would suggest going to your health food store and trying a tea called Smooth Move. Let it steep for quite awhile. If you do not get relief by the next day maybe you should look into a colonic. You may have a stubborn ball of dead parasited and feces.
(sorry so graphic) and you need that out asap.