Hi I am having stomach contact pain in lower epdomen and back pian too. I am having constipation from last 3 weekes and seems like color of poop has also changed . I did colonscopy as well but that shows normal. I am not sure what is the reason behind it. Nowadays I see poops with black spots on it. I don't have any weight loss, no loss of appetite but always has gas and heavy stomach and urge of emptying the stomach but can't. Let me know what should I do to diagnose it properly,it been more than 3 weeks now.