Welcome to psychcentral! I hope you can have the support you need here!!
Relapses are VERY common when you're trying to overcome self-injury. I have been there many times, too. I hope this doesn't sound like I'm just trying to solicit people to look at my website, but I have a website about self-injury and I think you might benefit from checking it out, particularly my page entitled "things to know". Here is the link, if you are interested:
www.freewebs.com/thecocoon_sipages
Anyway, a LOT of us here can relate to what you're talking about. You'll fit in great here! And it's good to have you!
Angela