Weird Bladder symptoms

I have been having strange bladder symptoms over the past 5 years. Pain in the bladder, burning during urination at times, dark colored urine, and a sweating sensation at the tip of my lower back after I urinate and have the burning sensation. I saw a doctor and he told me that it was stress, but somehow I cannot live with that answer. Can anyone offer me any advice or relate to my symptoms???????

It may bea Bladder or kidney infection.