I did the same thing a few weeks ago. I had been SI free for over a year and I just snapped one night at work and did it...I feel so bad about myself for doing it so I know where you are right now. What's important is to remember that yes, it did feel good but it didn't last long and it didn't solve your problem. Maybe that thought will help you be strong and resist the next time. I am hoping it does for me!