My testicles and penis are sick what do I do? Serious inquiries only?

What do you do when contstant thoughts of having sex with a close family member frequently enter your brain? This is happening and I am extremely horrified by this because I feel like a dirty pervert that cant be trusted. The worst part is it is arousing me. What do I do? I have problems with my nerves so I know its just a reaction I cant control and I don't seek out the pleasure in it but still its bothersome because I have a throbbing erect penis. What should I tell myself to alieviate the mental anguish in my mind when this happens. What does someone do if they have a perverse sexual thought? For instance a grown man getting aroused by little girls. He can't help that hes aroused and he knows hes sick and he doesnt act on it but he can't change the fact that he is aroused. How do you except this situation for what it is? I feel like a dirty man and its taking everything I have got to deny the impulses and I cant ask for help because I don't know how to. How do I except that my private parts are broken and can not be fixed? I am sick and am only aroused by perserve sexual situations. I deny orgasm and condoning the thought process but it wont go away. Is there a specific medication avaiable that is designed to numb the penis or the testicles? My penis is sick and should not be aloud pleasure what do I do?