Yeah, it's a problem because there are no clear guidelines about what to rule out and what to look for, what tests to run, all that.
Until they can find a virus or some kind of baddie that they can see underneath a microscope, as a dis-ease it's not going to be taken seriously by traditional medicine. Things that are systemic and require more knowledge of nutrition than the measley four hours they give in med school are just ignored as if they don't exist.
When I had thyroid problems, which causes a kidn of depression, the doctors kept wanting to put me on Zoloft. Sheesh!