I'm with Holmes on this one. Doesn't much matter what you call it... If you are purging that much, then it's a (big) problem for your health. Sounds most similar to Bulimia, so if you want to check out online resources you can start with that. However, getting professional treatment is the most important thing. Do some research and find out where there is a free or reduced fee health clinic in your area.

Take good care of yourself,
-ft