I'm really sorry to hear you sounding so sad
I'm a former anorexic and bulimic (I consider myself 90% recovered) so I hope my words can help you in some way....
There is a REASON, or there are REASONS why you are bulimic. And no, it is never just "I want to be thin" or similar. You will need professional help to work out what those reasons are and then to develop appropriate, healthy coping strategies.
For me, a large part of my eating disorders stemmed from a) perfectionism and b) my mother. I have been in various forms of therapy for 3 and a half years now to learn how to deal with these things without having to resort to using food. Its been a long, very hard road, but sooooo worth it
So in short, you need to seek professional help. A good website which can help you and refer you to a service in your area is
www.sfwed.org
Good luck!