"How Do I Defeat These Monsters Called 'Masturbation And Porn Addiction'?

Hi Nairalanders, ur advice is seriously needed here. No insults pls.
I've been struggling with Masturbation and pornography addiction for the past 15 years.
I've tried all I could to stop but all to no avail.
I've prayed and fasted so many times with no tangible result. What happens is that;
I'll stop for like six(6) months without endulging in it. But once am down I see myself in the act again.
It has been filled with ups and downs all dis years.
Anytime I endulge in it the aftermath is filled with regrets, guilt, shame and loss of inner power.
I always fill sad and empty afterwards.
I really don't know what to do again, I seriously need help. My relationship with God is as take here.
Pls help a brother.
U advice will be appreciated.

source http://www.nairaland.com/6308321/how-defeat-monsters-called-masturbation