frequent and foul smelling urine and sharp stabbing pains in woman parts and bowel.

I am female and 33.I have always had a discharge at one time or another, but it hasnt always had an odour.This odour is definately an offensive one and to me resembles something dead-which really does make me worry.I have started a new job and at first I thought it was nerves but a year later I am still having to shut the shop 10 times a day for a wee.I do wonder if smoking could be the cause as I have noticed It triggers something down there. Anyway what really bothers me are these sharp pains right up inside me sometimes,its hard to pinpoint which parts are affected by the pain but it definately ends up in the rectum!These happen about once a month and are often confused at first with my period.I have cut out coffee and sugar and replaced it with a Hibiscous tea and Honey hoping that my excessive need for caffine and sugar may have been the cause and maby somehaw by flushing my system out I could stop the smell at least.And I must admit my urine is clearer but still have the smell-no pain when I urinate.With these three things together is there anything in particular I should ask to be tested for when I go to the Doc?