Do i have an over active Bladder?

Patient: Hello,With the past month i am finding i have problems with my bladder ,im 20 years old so i doubt its over my age.I find i get a sudden urge fast to go to the toilet i feel as if im basically bursting to go but when i go theres hardly any urine and the minute im finished with the bathroom i feel i have to go minutes later again,and its usually at night time when i go to bed it comes on a lot faster.Its really annoying me because i find it is just such a sudden urge.Do you know anything like a remedy i can take to stop this or what do i actually have?Many Thanks ,Joan flynn