you may be thinking that you may not be actually drinking enough so increase your fluid intake till urine is almost watery white. If it does not help then get urine test done and also see that you are not constipated if you are passing hard toilet some times then put a greased finger in anus. If it is gripping and painful then you have fissure
which is due to constipation
and treat that. For that increase water intake, high fiber and high residue diet
, emollient laxative like cremaffin plus 1 tsf at night, isabgol powder 3-4 tsf in 3oo ml of water at night and apply zincal cream inside anus before bowel action. Also increase physical activity in form of walking, games or exercises. Try this and let me know how you go.