Hayley, I have said numerous times that people can private message me if they need to talk. You can appreciate that even though your personal struggle is truly significant, there are a lot of people I speak with (and there have been literally hundreds of anonymous posters beyond that with their own struggles) so it is nothing personal.
You have two different disorders and sadly you cannot attack them both simultaneously. For starters you are a restrictive-type anorexic, and secondly you are a binge eater. This is actually a common cycle for people who start recovery; they've only ever known restriction, but DO want to eat a healthy number of calories a day, and so restrict heavily, then go hell-for-leather and have a big binge to try to even it out. Sadly, the see-saw that are our bodies doesn't like this and tries to balance it, but our disorders fight one another and as such, we always go even further to extremes.
The truth is you have to underpin your anorexic restriction FULLY first. What I mean is, eat a normal (1900-2500) amount of calories daily, and as you're only seven and a half stones, I would probably say go for one of the higher amounts to get you to a less frail state. You MIGHT still binge during this period, but whilst your body slowly adjusts to a "normal life" again, the desire to binge will decrease surprisingly rapidly.
I personally was put on a 3000-4000 calorie a day gaining diet when I was REALLY ill, and after the initial gain, I found it hard to NOT eat everything in sight. But it is NORMAL. Your body needs to take time to readjust to what is NORMAL. Think about a rubber band. You stretch it so far one way for so long, that let go and PING, it flies off in the opposite direction to the extreme, but flicks back almost as quickly. But you HAVE to - and I stress that - HAVE to let go, or it will never happen.
You might need to address the underlying issues of this first disorder before the other slowly dissipates.
Once again if anyone needs me, PM.