Shlomo,
It sounds like you're trying really, really hard. Which is great. It means you're really motivated -- maybe because you have come to realize that you can't go on living like you've been. But simply wanting to quit and fighting urges, for an addict, is typically not enough. We call it "white knuckling."
Personally, I tried to quit many times. Until I came here and learned that I was an addict. And learned a skill called surrender. When I feel any urges -- be it the urge to entertain lewd thoughts, look where I shouldn't, or more -- I verbally surrender that urge to Hashem and ask him to take it from me, to fight it FOR me, because I am unable to fight it on my own. Baruch Hashem, for He has done so for me, one day at a time.
Now don't get all excited. He didn't take my Y"H. He just helps me when I ask sincerely, telling Him I that I honestly don't want to lust.