Prodiver

Go to your Doc, Sub, and demand to see an endocrinologist.

If he refuses to refer you, make the point that if you do see one who decides you do need treatment, your Doc will be culpable.

If he still won't refer you, ask to see another doc, and if necessary change docs.

Alternatively, if you can afford a few hundred pounds, you can identify an endocrinologist and phone for a private appointment.