where do you live?? in san francisco there's a network of free and sliding-scale clinics (incuding the women's community clinic), probably the same in nyc or other big cities.

A friend who had a severe eating disorder recieved good treatment at at the Renfrew center in Pennsylvania which is one of the top in the country. It's near Philly. they are a very pricey facility but will probably know where to find other centers that might treat someone without insurance. I bet if you look up their website and call them, they can refer you...