yup devise a plan - maybe initiate the conversations so you can direct them away from your disorder.
talk to your mum - i know you siad she doesnt listen but hey its worth a try - and you have nothing to lose ok
Holidays can be very stressful - which is a shame cos they should be fun - you say youre at school can you talk to the school counciller if there is one? and if you think they are any good.
If not there are help lines in most countries you can ring - your dr? a Therapist if you are seeing one or clinic? they can all give you hints
here are a couple of articles i found that may help
http://blogs.psychcentral.com/food-f...-the-holidays/
http://blogs.psychcentral.com/weight...ting-disorder/
hope it helps
let us know how you get on ok
P7
__________________
Its not how many times you fall down that counts 
its how many times you get back up!
(Thanks to fenrir for my Picture 
)
When you have come to the edge of all light that you know and are about to drop off into the darkness of the unknown,
Faith is knowing One of two things will happen: There will be something solid to stand on or you will be taught to fly.
by Patrick Overton, author and poet