Having very similar symptoms. Tingling and pain in the tip of my penis. Sometimes the meatus gets a little irritated and red. Perennial pain. Tested negative for all stds. Had ultrasound of bladder and finger wave and psa test, all normal. Uro scheduled cystoscopy but I cancelled it, for now anyway. Been on candida diet for several weeks now. Not crazy strict though I still eat quite a bit of brown rice and brown rice cakes. Just startled a 30 ppm colloidal silver solution yesterday 1 tsp every 8 hrs. Been taking probiotic, apple cider vinegar, grape seed extract and cinnamon. Still hurting. Problems started after 2 courses of antibiotics for sinus infection. Please help!!