I started using the fiber supplement (inulin) I was using it in the morning and in the afternoon. It did seem to cause quite a large amount of gas that I was unacusstomed to. I took it one day and then ate lentil soup. I was in such great pain from bloating a bit later that I could hardly walk. Now after a day or two I am still in pain, but it seems like my insides are sore. It is most painful on my right side near where my kidneys or gallbladder would be. Can you pull a muscle in your gut?