Hi, Noted the history and understood the concerns. Such a severe pain in middle of abdomen near belly button that it causes cramps but sharp at times, increasing on leaning forward while sitting can be due to the following reasons: Pancreatitis, Colitis affecting transverse colon, Gastritis and or duodenitis with or without ulcer formation, Obstructed epigastric or umbilical hernia. This can be well diagnosed by the following ways: Consult your doctor, preferably a General Surgeon or a Gastroenterologist for clinical evaluation, examination and relevant investigations. Ultrasound of abdomen, CT scan of abdomen to confirm any positive findings as discussed above. Tests of stool, urine and blood. These will give a probable diagnosis so that a definitive further investigations and proper management can be done. Till then take a PPI, Domperidone and an antispasmodic to relieve pain. Take only fluids orally. You may better rush to ER, earlier the better. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. T Chandrakant