Welcome Newstart. What I understand from your post is that you masturbate and want to stop. so I'll stick to that.
Does anyone besides us virtual people know about your situation? Isolation is a big problem for us. I've got a little clean time under my belt, got myself into a danger zone, and still needed the guys here to remind me I was isolating and needed to be with some real folks for love, support and accountability.
There's a saying that "You're only as clean as your secrets". When you're making love with your wife, she is innocently loving you. You, on the other hand have a secret from her--you lurk, or whatever you want to call it. So you are tricking her. somewhere in yourself you know this. tricking someone, let alone someone who loves you, is wrong. So you feel guilty. Does that shoe fit? If not, toss it.
I believe wet dreams are neither slips nor falls. And yes, crank up your shmiras eynayim and yes,
newstart wrote on 25 Dec 2011 18:02:
thinking less about women and trying not to stare at women in the street will help.
If you need only to "strengthen yourself before you go back to the world of challenges", then I think that means that when you're not in the world of challenges you have little or no difficulty with lust. This is a wonderful blessing.
I wish you much success. Hatzlocho