Hi, sounds like the old UTI, two things that can cure it are anti biotics or cranberry juice, the juice take 3 times a day for 7 days, that should clear you up.
Good Luck
E.Coli( Escherichia coli) is a a normal inhabitant of Castro- intestinal tract. It it enters urinary tract, it may cause infection. Because peculiar anatomy of female genitals( proximity of excretory and genital system) females are prone to E.Coli infection.It can reoccur again and again if the treatment is not completed, eradicating infection.
It sounds like you have a urinary tract infection. Did you buy some pills over the counter? If so, these will only take away the pain for a short time. See your Dr because if this is a UTI you may need antibiotics.