What Causes Frequent Urination With Pain And Itching In The Vagina?

Actualy from last one month i am suffering from vaginal problem.. 1)liquid discharge 2)lot of pain during urination and frequent urination with less amount of urine and sometimes its not even in control 3)itching and burning sensuation just d bottom of entrance of internal vaginal,i think its as calles vulva. 4)cramps ,back pain.abdominal pain specially at night 5)didnot got my periods evn ,it was held last 29th November 2014 around I dont know whats going it burns a lot..n urine is not at all under control, jus flow of.sometimes its s perfectly ol rite n sometimes it too worst.it occur anytime .two days it remain good den it occur problem den 2 days worst den again good.sometimes morning m worst n by evng complty fine n vice versa.and it smells realy damn fishy.i had protection stil dont know wats happng.i chckef out d kit evn its negative. jus fluid is dschrgng .m realy worried. pls hepl.i wan my periods its olmst more dan 50days