I have suffered from IBS-C for more than 10 years now. I was diagnosed when i was 13 and now I am 23. I have also had very severe bloating that kept me from falling asleep several nights.
One extremly effective treatment for this excruciating bloating I have found that gives almost immediat relief is eating a small portion of oatmeal porage sprinkled with raspberrys on top.
Another tip is to stay clear from artificiell sweetnerswhen having IBS, they really do interfere with the gut bacteria and allways ends up causing digestive issues.