I have not been on this site for months. Sorry. My problem is almost entirely gone but I am on Lyrica, Cymbalta, and Oxycodone. All are for nerves. I have non length dependent small fibre neuropathy. It spreads fast and to almost everywhere on the body. I don't know if the sting in the head of my penis was a first symptom, which I believe is the case, or just a separate issue. In any case the meds for nerves has calmed it down to almost nothing. I first went to a dermatologist andwas told abrasion from rubbing on underwear. Then neuropathy by a three different urologist. Of course the neurologist insisted it was a urology problem until just recently. Get someone to prescribe meds for nerve pain and see if it helps. If it does it is a nerve problem. Good luck.