Frequent Urination. Go. please suggest.

I have been urinating a lot since 26th Sept last month.once i come back from washroom still will always 24*7 urge to urinate.If i go to washroom urine comes out.Few days i was not able to sleep the entire night.There is no pain or burning.Local doctors thought it's UTI so following tests were done Urine culture and routine-nothing found Blood CBC-nothing found Diabetes Fasting-normal Dengue-negative Malaria-negative USG whole abdomen- have polycystic ovaries and fibroids in the uterus.this was there already since 1 year But Antidiuretic hormone report has problem-value is 189 pg/ml Local doctor has suggested brain MRI I am still taking uripass one tablet thrice a day.Duonem CV one tablet twice a day. I have done 24 hr volume test for urine leaving the morning one.So observed that i am urinating close to 2.5 litres with intake of 2100 ml water. At night i urinated close to 500 ml at one go. Please suggest.