Boncha, I too have been battling ana off and on for about 15 yrs or so. I have finally got my weight to a stable amount and have been maintaining it for about a month now. I have to make myself eat lunch most days because I am so busy with work. Which means I have to take the time to fix and pack my lunch in the morning before heading off to work. It is not easy, but I make it happen. I have no clue how much I weigh and though there are times that I wish I knew, I know that it is for the better that I don't know. Every time I have to be weighed, I ask to be weighed blind and for them not to tell me how much it is. If they question me or give me a look, I just gently explain that I am anorexic and can't know my weight. Most are more than willing to do that for me with that little explaination. Does you old therapist know about ana? If not he sounds like he needs to be educated on it just a little bit as well as working on his "bedside" manner. I can understand how angry that made you feel. My dietician says that she allows for a +/- of x lbs before she gets worried. She hasn't told me what that is, but she also told me that she isn't going to let me over eat. Have you looked into getting a dietician? For me they really help along with a great therapist who really understands EDs.
If you ever want to talk privately, feel free to pm me. I know that sometimes it is nice to talk to someone your own age who is going through similar life events.