Hello Irritable bowel syndrome is a gastrointestinal disorder characterized by altered bowel habits & abdominal pain in the absence of detectable structural abnormalities . In IBS usually few substance aggravates the condition as these are,coffee, disaccharides, legumes & cabbage . Sometimes high-fiber diets & bulking agents , such as bran or hydrophiulic colloid are frequently used in treating IBS. Antispasmodics provides relief in abdominal cramps. Antidiarrheal agents for diarrhea (used0. Antidepressant , antiflatulence therapy . As I mentioned that this is a complex disease so very difficult to treat but with the help of physician and psychiatrist , the treatment is possible . In my opinion consult as mentioned above. Kidney pain as you are feeling , get in an ultrasound of both kidneys and , if any thing abnormal consult a nephrologist and get his opinion. Good luck.