Thank you very much for contacting healthcare magic. According to your complain you have irritable bowel syndrom. Irritable bowel syndrom may cause abdominal bloting and cramp problem. Constipation is released by diarroa. More mucus in stool present. Change consistency of stool and frequency also. Long standing irritable bowel syndrom may cause weight loss and anemia occur. Abdominal ultrasound is normal in irritable bowel syndrom. Endoscope is helpful for further diagnosis. Intestinal infection like celiac disease may cause abdominal problems and long standing disease cause weight loss. Colonoscopy is helpful for further diagnosis. Stressful condition may worsen the situation. I hope my guidance is helpful to you. Take care. Thank you very much.