What Causes Constipation Even After Taking Natural Supplements?

I am suffering from constipation... i either pass loose motion or nothing for 2 days. my stomach gets blaoted up in the evenings. frequent headache and cold. I go to gym 5 days. drink 2 to 3 litres of water. But i feel my food intake is not that great. I have Idli in the morning, 2 chapathi with any vegetable gravy in the afternoon, tea and biscuits in the evening and after gym afresh fruit juice. I consulted ICAM wellcare clinic in Bangalore and i already finished two colon hydrotherapy and herbal enema... She has given me natural supplements Please help me if i am on the right track?