Hi there. Irritable bowel syndrome is condition where there is diarrhea and constipation alternating with severe abdominal cramps. I would suggest you to take allopathic medicines as ayurvedic medicines contain plant extracts which would not be tested clinically. Sometimes they only can trigger your symptoms as in Ibs you ll have allergy to certain foods,plant extracts. Your weight loss could be because of Ibs due to diarrhea leading to malabsorption. Treatment of ibs includes lifestyle changes, avoid smoking alcohol, caffeine, have more fluids, avoid allergen foods which trigger your symptoms, take medications.