Burning sensation after urination.

For over an year now I am suffering from these symptoms. After urinating I feel burning sensation around my genitalia and lower abdomen. The symptoms were relieved a bit during my periods. I have consulted both urologist and gynaecologist. The gyno treated me for all possible general infections all test normal. In the urine culture test I repeatedly kept having Klebseilla pneumonia and the urologist gave Monocef injections and that was the only time I could urinate properly without any burning or feeling of heaviness. Some days after this treatment my reports came normal but doctor suggested I had problem with my bladder and it was retaining some urine. Fast forward to now I am still having these symptoms and it is most prominent after waking up in morning and before going to sleep after urinating. I am taking sitz bath and drinking more water but still these symptoms are reoccurring, please help me this is affecting me mentally and taking a toll on my mental health. Please advice.