I have been dry masturbating a lot lately, and for the past four days i have an itchy feeling on the tip of my Penis from inside. No any other symptoms. "Feels like gonorrhea" but its not, cause i haven't had sex in a REALLY LONG time, and i make sure i always clean myself well. 

So i was wondering before i go to the doctor if anyone can help me? 

Could it possible to be increasing in Mineral salts in my body? Or is it because of the masturbation?