Hi all,
Thanks for all the replies and support. You all have some really, really good insights.

I did receive professional help to deal with my ED, and that is how I managed to stop purging--lots and lots of therapy.
Alas, being overseas, professional help isn't much of an option--very limited English language resources in my current location.
However, last night I had an epiphany. My ocassional binges seem to come when I've been overly restrictive about my eating--the dog breaks the chain because the chain is too tight.
So, until I can access more therapy, I've decided to stop worrying about food for a while (although I've cut out soda and booze--yay me!). I'm just going to work out, because it seems to help my mental health, and eat when I'm hungry. I know, I know; ground-breaking stuff, right?
Thanks again, and please feel free to post any more suggestions.