for a few days i have been having sore twinges at the end of urinating and theres also blood in my urin and today the middle of my back is in agony so i went to the doctor and she said it dosnt look infected but its testing infected and theres high levels of blood and protine in my urine but she didnt explain what was wrong,i was wondering could i have kidney infection and is it serious?the pain is cripling but she didnt seem to be botherd