Do talk to your T and provide the details you shared here. It does sound like an eating disorder to me. If your therapist is not well-versed in treating eating disorders, perhaps the two of you could work through a book together or you could see another therapist as a kind of adjuctive treatment specifically for the eating disorder. That way you could continue to see your current therapist for the issues you currently are working on with him.

Take good care,
-FT