iam 17 years old ... i need to urinate more than usual ... i always feel pressure in the bladder after drinking water .. this problem is from 1 month... 1 year back i had suffered from this problem .. i checked a doctor and he took urine test and ultra sound... he told that there is nothing wrong... this may be due to UTI.... gave medicines and i was well after almost 10 days..... do i need to contact the doc. again