I had anorexia when I was younger. I'm not very comfortable talking about it so excuse me if I'm brief. I'm not trying to oversimplify or treat this as easier or simpler than it is, I just cannot bring myself to talk in depth about this.
The good news is, I got better. My appetite sucked and I usually perceived eating as an ordeal and a hassle, but I got to a point where I ate enough on average. It was hard on me and hard on the person who helped make sure I ate enough (I was lucky enough that someone was around to help). The better news is, post top-surgery and time on T, I'm much better. I have a healthy appetite and the old unhealthy thinking patterns rarely rear their fugly heads anymore. When they do, it's usually in a much smaller way than before and it helps to focus on my goals, and focus on taking good care of my body. For me being strong and healthy is important, and being malnourished doesn't help me achieve that. You said you're busy with school and theatre - being malnourished doesn't help with academic goals either.
Have you considered the possibility that dysphoria is distorting your perception of what you want? If you prefer the slim look, that's one thing. But there's a big difference between healthy and slim, and "stick". Perhaps dysphoria is leading you to think, on some level, that "stick" is the solution. That at some level of thinness, the dysphoria will go away. Intellectually, consciously, it's easy to know an eating disorder only causes problems and doesn't solve any. But subconsciously it has a way of convincing you it's what you need or want, of twisting your perceptions.
There is no level of thinness that takes away dysphoria. I got down to a dangerously low weight and it never helped the dysphoria whatsoever. Not only will the eating disorder never fix your problems but it's jeopardizing an opportunity that will ACTUALLY help you (getting top surgery). Focus on getting your ED treated. Make it a priority. Being reasonably healthy is key to pursuing whatever goals you have in life, and anorexia will take that away from you. So anything that you would prioritize - getting top surgery, doing well in school - remember that getting your eating disorder under control is part of achieving that goal.