Continue with the research you are doing; doctor's opinions, naturopaths, books, online searches, friend's thoughts, prayer, and hopefully you'll figure this out.
The only experience my family had to losing hair was when we started drinking distilled water and my wife started losing a ton of hair. But before we made this connection I was looking at getting a water distiller to make our own pure water which I thought was the best water only to discover from the very first search result that distilled water was actually very bad for you, because distilled water depletes the body of its minerals. Then at the same time we found out that the elderly lady next door with very thin hair only drank distilled water and a family that we knew that also had thin hair also only drank distilled water. We immediately switched to spring water and my wife's hair slowly came back.
Good luck :)