Have you seen a gastroenterologist? A couple of my friends have had this kind of sever constipation and tried everything you’re trying but it turned out to be something called Cibo. Cibo is some sort of bacteria overgrowth and it can be tricky to get rid of, but will at least help you with the answers… Something else that you may want to try (absolutely not a longterm solution) is a low FODMAP diet. It’s definitely helpful to try even before you see a gastroenterologist because then you can explain that you tried it already.
