Does he actually know that you have an eating disorder? Have you talked to him about this?

If not, I'd go to one more session, tell him about it, and ask if he knows anyone that he can refer you to. Tell him that it's getting worse, and you're now having physical symptoms that have concerned your doctor.

If he already knows, and you've talked about it - yes, I think it could be considered unethical, but I'm not 100% sure if it's actionable (or how it works in your part of the world). In general, my understanding is that therapists are not supposed to continue seeing someone that they are not qualified to help, or that is not responding to their treatments. But, with therapy, that leaves a whole lot of gray space.

In your case... you know what's going on with your body, you're aware of it and have been down this road before... I'd start looking for someone that has the experience to really help you. You've already lost a year, and EDs (as you know) can have serious physical consequences... you deserve someone who knows what they're doing and can help!

Good luck...