Brave... no, you're not the only one who does this. But if you've done this before and gotten any kind of help, you know that it's serious and you don't need to -- or should -- go through it alone. Both behaviors have much to do with control, and you're probably feeling pretty out of control right now.
I won't tell you to tell your doctor (even though that would be a good idea I would think) or your family --- but you have taken a big step in telling someone by writing it here ----so maybe you are ready to take the next step.
Since it probably feels safe to tell it here... could you take that next step in a safe way? On the phone.
Check this out:
http://www.vinland.org/scamp/institute/help.html
I don't know where you live, so some of these may or may not be close. But there are a couple of 800 numbers. You can still be anonymous that way, but have someone you can talk to who doesn't know you. You'll be in control.
here's something from someone who'd been there:
http://www.vinland.org/scamp/institute/dsh.html
This is bigger than you need to handle on your own. I think you're ready to reach out or you wouldn't have posted here... take that next step.
Good luck, hon.