Hi there. I have recently recovered from an ed (anorexia), but there are still bad times and good times. I have huge sympathy and empathy for you, as I know how agonising it is, and how exhausting and all consuming.
It is very frightening to consider opening up, but, believe me, once you take that first step, it gets much much easier. Someone on MN very kindly told me that it was like standing on a precipice on a cliff. You are standing there looking down, thinking "it's safe here, I don't want to move from here" but you have to take that step and leave the precipice to find the path home (or something like that!). The point being, an ed feels safe and secure, but of course in reality it is a lie, it is anything but safe, it is no way to enjoy life, as you know.
How to take that first step? There are various ways, but hopefully your GP could refer you to an eating disorders clinic, ask if your area has one. You don't need to be underweight, as you clearly have an eating disorder. Have you got a good friend who you feel comfortable with? That was my first step, to confide in my friend. Any do you know what? She was (and still is) wonderful, non-judgemental.
That's ultimately what you need, someone who is non-judgemental who can listen and support. I am not sure your parents would be the right people, they may become rather opinionated and worried. Do you think they would support you, or stir things up? Worth thinking about so you can plan what to do when they arrive. There is always the "I have a stomach upset" excuse isn't there? People eat very little when recovering from that, then they won't suspect anything. I had anorexia for about 9 months, and my parents only realised when my weight was seriously poor. I got away with it for a long time. I had no intention of telling them, as they are actually the cause.
Counselling is the key to recovery. Finding a new way of dealing with problems. Learning to like and love yourself. I understand that childcare is a problem, is there any way of finding childcare? Because counselling is very important. It is also a safe place, non-judgemental and, for me, I did not need to discuss what I was doing with anorexia, but the counsellor was very keen to explore the way I deal with life, so she could support me to change my thinking patterns. It does work.
One more thing! What really helped me was to see a healing therapist. She helped with the inevitable depression and helped to cut the bond between food and emotion. I can tell you more about that if you wish.
WIshing you all the best. I found posting on MN invaluable support. Please let us support you.