Congrats on turning your life around and realizing what's going on. That's wonderful
I don't have any medical or personal experience with eating disorders and fertility, but I will say that I don't believe that you could have damaged yourself in this manner. I did recently see that a smaller percentage of overweight women found it harder to concieve. I don't know if the reverse is true.
Consider the depraved women in third world countries who conceive and bear healthy babies: it happens more often than not...and the baby is healthy at birth, and the only reason why the baby might die or become sick is because of the undernourishment AFTER he is born.
What you can do now though is make sure you eat a balanced diet and become healthy. I don't know if you will or will not have difficulty starting a family in the future, but there are other factors that could weigh in besides the previous eating problems, so don't blame yourself if you can't seem to be successful right away. IF you do conceive the baby will take everything he needs from you, so it is important that you keep up your stores and eat healthy for yourself before, during and after a pregnancy.
All the best.