I am inclined to agree with your GP in that he should have referred you to a specialist and it could be seen as unethical of him not to. It sounds like he has good intentions but doesn't have the knowledge and experience to help you and to identify that you werent doing well. Yes, he did tell you he wasn't a specialist but i still think he should have checked in regarding your symptoms considering your history. I dont think it neccessitates reporting him or anything like that, but I'd let him know what your GP said and that you are going to see a specialist for your ED. You can always see him for talk therapy also, but yoiu should see someoene specialized to help you with your ED.