clickman, I believe your life/health is more important than your reptiles. If you need inpatient therapy, give your parents a book entitled "How to Care for Reptiles" and ask them to help you out.
You need to eat and you probably need to gain weight, too, not just maintain your ED weight. At first your body is going to feel very strange getting used to eating again, and you might even have trouble keeping food down, but you have to keep trying. Your LIFE is more important than your body image, please, please, remember that. Your life is also more important than veganism, although you can certainly recover and remain vegan.
Anyway, some high calorie foods I suggest would be vegan chocolate bars/donuts/candies, in addition to making some high cal muffins- just use egg replacer or flaxseed to bind, soymilk, and then fill them full of goodies, like nuts or even chocolate chips...or better YET, chocolate chips AND nuts! You could do the same thing with cookies, though I am partial to the muffin, myself. Eat avocados, use olive oil, get some nuts on hand- almonds, cashews, peanuts....trail mixes are good, too. Try to use coconut or coconut milk in your recipes and eat some nut butters as well. At a certain point you are going to have to eat some serious good food to help your body recover, and I believe you can do it.