Excess drinking water Frequent urination

Hi From past four days iam getting urge to drink water again and again. So iam drinking around 6 litres minimum from past four days. This thing was started suddenly. And when i drink water i feel urge to drink it. Iam getting urge to pass urine frequently and duration would every 01 hour or 11/2hour. This has also disturbed my sleep as i have to get up to pass it. This frequent urination has disturbed my lifestyle. - There is no pain while passing urine - urine color is white - urine coming in free flow - no bleeding - no burning sensation Iam on High BP meds(boarder line) : - Losar 50 - Natrilix SR My medical history is already updated on website. Kindly help. Why this problem is happening.  And what should I do. Thanks.