This is the problem with ED, quick fixes are chosen over logic. Knowing what you know, I am sure you know that getting on a regular diet(this is subjective in regards to regular diet) in the long run is the best way to lose weight. You already have shown that you went from no calories to 1k to 2.5k. Next will be a cake, pie, fried foods, and maybe a cookie(ok, I am being sarcastic and making a joke.)
I think this is the best advice anyone can give you. If you are willing, find a RD. Try them out, do what they say. If it works, keep with it, if its bad, find another. I have seen RD that are so dumb it makes you wonder how they passed high school(this is not a joke).
Really though, find someone who gives advice and that you get along with and do that. Ignoring all those small tricks, it always comes down to IN vs OUT. Burn more calories than you take in. It really does not take that much. Ignore most books and websites. They will just try to sell you stuff(or in the books case, it sold you the book).
Food wise, really look at hungry girl if you want to find lower calorie foods/recepies. Next best thing to a proANA website.
And I am really trying to not sound mean, but dont always view knowledge of bio and phys as an ability to stop before you go to far. An example is 75% of Type 1 diabetics polled admitted omitting insulin as a way to control weight gain(this was from a Journal study done in late 80's early 90's). Diabetics in general tend to weigh more than people their age because sometimes they must eat more, among other reasons. Thanks to the education given to them that omitting their insulin will cause their body not to obsorbe any calories because insulin is required to turn glucose into energy. Hence why before T1 was understood many would be emaciated when they died.
Sorry for my long rant. In the end I hope everything works out for you. My view still stays the same as it has in the past, that most people in ED or going back into it know the difference between right and wrong, its what they choose to do(until it goes to far, thats when choice is gone)