It hurts and swells in your testicles. The reason is that if you get hurt in the testicles , if you get pressure , even if you masturbate excessively, it can cause pain in the testicles. You should seek treatment from a homeopathic doctor. If it is infected with varicocele, you will get in a lot of trouble. Therefore, if you masturbate quickly, remove it and take homeopathic treatment. Painkillers cannot be given without knowing anything.