I have certainly had those days of panic where you think they will never eat again, my dd occasionally withdraws, one time not eating or drinking for 24 hours and I called the emergency CAHMS line and they said it's up to you to do what you think is right?! Obviously I didn't know which was why I was calling.
you know your dd best, in my case, I've realised that with my dd, sometimes a strategic retreat is best so we can advance, but we were not on a meal plan at the time, she wouldn't accept any such thing, although we are now and she's actually doing quite well on it. Things change, and times change. I don't believe we've cracked it at all, but knowing that things can be different, and someone who adamantly refused or would even storm out/leave if presented with food is now eating it quite acceptingly if grumbling, is good to know.
I don't think you are yet in the stage where you can stop being incredibly anxious about every meal, because you don't yet have a team around you (if you got accepted by the Maudsley that would be great, you could also go for private referral if it's in your neck of the woods) and the longer term perspective. When we lose a battle, say my dd doesn't come down til 2pm and hasn't eaten anything that day, I used to get upset, agitated, mention it every two seconds, cry and so forth. Now, I just say 'catching up to do', how can I help' I tell myself also that no one meal or one day is the critical day in this illness, it's easy to get caught up in the emotion of it all, but ultimately they have to learn to eat themselves (my dd is 17 so in one year will be out of children's services and make her own decisions about even engaging in treatment) and long-term sustain themselves.
I really feel for you, this is a very hard journey to be on, but things will change over time. I thought going into hospital would be terrible for my dd but in fact it's helped a lot having someone other than me tell her what to do!