Lactulose
"I have had chronic constipation  since 5 yrs old I had chronic pain from a  condition I was born with, and at 30 received oxcontin for the pain other wise I would be in a wheel chair. As a child after eating I would bloat I still do even on just 2 cups off coffee, it has taken 4 days for lactulose to work but I feel a lot better my Doctor said water water water! as the lactulose draws the water into our bowels, she also mention try the msp diet as you can be misdiagnosed  as IBC and it could be certain proteins  and sugars as well as wheat, barley, beans, dairy and makes it too hard for our gut to process."