I always feel sick after eating. What should I do?

I have bulimia so should this come as a surprise? It has got to the point where if I consume the slightest bit of food I just feel so nauseous even if I'm not on a binge or if it's my health food. Help... This is so debilitating it never used to happen! I have to lye down after eating even a morsel sometimes for over an hour and struggle on public transport.