hi, i have a constant discomfort of burning in my bladder and i have been to see my gp on a number of occasions and there is no infection in my urine , and i have also drink water all the time to and i have also taken natural herbal tablets and they to have done nothing, but i have once again this burning in my bladder for 6 weeks not just when i pee all the time, i thinking its something in my diet possibly that im eating or drinking could you give me any advise what it could be and how to prevent ?