Thank you for your question! I understand your concern. According to symptoms explained by you, it seems to be the condition called Irritable bowel syndrome (ibs). It is disease characterized by chronic abdominal pain, discomfort, bloating, and alteration of bowel habits. ibs has no known cause. It commonly occurs in females. For improving your condition, following measures may be useful: a) Take low carbohydrate and fiber rich diet (like leafy vegetables, psyllium husk etc.) b) If there is severe abdominal cramps, try hyocyamine tablets (buscopan) for symptom relief. Consult your physician for dosage according to your symptom severity. c) Yoga practices and exercises which can help in decreasing your stress. Your menstrual disorders may be due to stress related. Try above measures. Thank you