I think it was wrong of your GP to tell you that your T is being unethical!

When I went to my GP in regards to my ED, he asked if I wanted therapy in the NHS and I told him that I was already having therapy privately.
He said that was fine and that they would just keep an eye on me (regular weighing and BP- which I declined anyway).
BUT I didn't have major physical issues because of my ED at that point. Maybe you need to accept that although your T isn't being unethical he should either be working with you more on your ED, or refer you to someone who knows how to 'handle' EDs and has more experience.