How Do I Seek Help for My EATING DISORDER?

I’ve been bulimic for 3 1/2 years. I’m 16, 17 in December. I got caught in March 2007, I had told my parents I’d only been doing it for 2 weeks and I promised I wouldn’t ever purge again. They are still convinced that I haven’t done it since then. Getting caught was the most humiliating thing and my mom told me she would take everything away if I ever did it again. I binged/purged a few more times and then quit for about a month. Then I started again. Then I’d stop. I started again. Again and again. In January 2008 my mom scheduled a dental appointment so I stopped. I started again. I can’t stop. I don’t even want to binge, I don’t even want to purge. I hate eating but I do it just to do it. I eat when I’m not hungry. I binge/purge because it is routine. It’s an addiction. My mom is in drug/alcohol rehab right now and this week is family week. The talk about addiction and honesty really opened my eyes and I feel motivated to get help but I don’t want to tell her and add to her issues and cause a possible relapse. I don’t even know if we can afford to get help after paying for my moms help. At the same time though, I am sick. I purged at the rehab center today. About an hour ago I ate five cookies and a pint of strawberry cheesecake ice cream that I didn’t even want and then I purged it in a public restroom. I binge/purge more than once a day. All of my money goes toward food. How do I seek help for this without hurting my moms recovery?