Hi ROSB,
Hope that locking self in bathroom helps, if you can try and get through these first few hard days, it will soon get better. Your brain is just trying to convince you to eat, don't listen. You chose CD for a reason, you can get through it, even if it means a hot bath, an early night or anything. I've had to go to bed at 8pm many a night to keep me from hitting the cupboards.
Good Luck xx