I had a urinary tract infection about 3 weeks ago and had two courses of antibiotics which seemed to clear it up - my last urine sample was ok around 10 days ago. But I've now got quite regular unpleasant twinging cramping pains in my left side / back which I suspect is kidney pain. GP says if the urine test is clear I shouldn't worry but I don't know why I'm getting these. Anyone know anything about this kind of thing?