I shouldn't be posting now, it's before 9:30. But I happened to see this post, and we all love Ano so much, I couldn't resist...
Dear Ano, The battle with lust is not an easy one. When feeling weak, turn to Hashem and talk to him from the depths of your heart. Tell him you have no one to turn to, no one in the world but him. Say Shir Lamalos eso einai.... with all your feeling. Davka because you started to slip and feel so broken hearted, that is when teffilah can accomplish the most.
Know that what you saw, even though you slipped a little, this was from Hashem. The yetzer Hara sees you getting close to 90 days and he is very worried. This test is a big one. The hardest tests are when we feel we already began to slip a little, so we say "What's the use?". But those are the REAL chances for super-growth. Like the story of yosef, where he already began to slip and yet overcame his desires and achieved the highest level of purity imaginable, bringing down to the world the Koach for all the yidden who went down to Mitzrayim to survive for 200+ years without slipping in sexual aveiros, as Chaza"l say. You are bringing down a huge Koach for your future children, Ano, Davka in these moments when you feel you started to slip, and still don't give in.
Other ideas, put on some leibidik music on your MP3 and go for a nice jog, get it out of your system, make yourself feel happy!! Oh, and read today's chizuk e-mail of-course :-)