Thanks a lot for all the answers.
I am just back from the doctor, they did a urine test, and to my utter surprise send me away saying "you don`t have an infection! "
Which is absolutely IMPOSSIBLE, since I have so much pain in my back and waist, that I haven`t slept for three nights already. I am going so often to the bathroom, and the smell of the urine is really heavy. I have a metal taste in my mouth, nausea, itchy sensation, either can`t hold the urine or can`t squeeze a drop.
I am really confused. Shall I ask for a second opition. I absolutely can`t believe there is nothing wrong. And I have already have one UTI. I am just afraid that the infection can spread to the kidneys. But on the other hand - can a test be wrong?