I have had burning in my urethra, scrotum, prostate, lower back pain, feeling unwell, etc for over 6 months. It all started after a sexual encounter with a woman. I have been tested several times for STDs and all are negative. Both blood and urine tests. Over the course of 6 months, I have been prescribed several types of antibiotics starting at 2 week cycles then up to 6 week cycles for over 4 months. The tip of my urethra is very dry and has blemishes around the rim(red vessels) and head(white spots). No bumps or sores. I also feel pretty itchy. My intestines feel as if they are swollen. My lower back pain is on both sides. My doctor does not know what it is. He prescribed me an abdominal CT scan with IV and oral contrast. What could this be? I feel like it is yeast/fungal but he says its unlikely. However, I noticed my body reacts quite a bit to changes in diet. Eating healthy and staying away from sugars/carbs.