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I'm wondering if that you will see will be the physical or the etheric body because when you are in the astral you see astral things. Also I think that the human aura is not visible in the astral although objects are glowing. Maybe an etheric projection?
There is a man named Rodrigo, who teaches at the Miami center of the International Academy of Consciousness that specializes in courses on Projection, who lectures about the diagnosis, prevention and treatment of illness with projection. He can be reached at the website, IACworld. I'm not sure if it's .com or .org etc., but if you just put IACworld in Google or some search engine, you should get it.
What if you OBEd and then used your astral sight to look at your physical body and examine what's wrong with it? It would be like an Edgar Cayce-style diagnosis, you could also ask for guides to give you advice on what to do to fix things.
Has anyone tried this?