oh, and you can understand all there is to know in the universe about it and still not be terribly successful in treating it *because* the causes can be so varied and they can mimic so many other things. More often than not it's a journey of self discovery-doing what feels good which makes you feel better. Yes, there are many things that can assist that journey....but from a spiritual perspective you are still seeking balance (emotionally AND physically.) It's balance that allows healing. All ancient forms of medicine acknowledged this in their own way.
All of our crazy tests let us see things we couldnt' before....but they're generally just giving you more red herrings IMO. If we can stop micromanaging for five seconds, and work on the big picture (adequate and restorative sleep so the kidneys are supported and the vital current flows thus recharging the "battery", eating in a way that fuels your body and makes you feel vibrant, engage in activities you enjoy, give back to the world and being active in the community etc.) that actually can go a LONG way to healing. It can help oxygenate your body, repair (growth hormones are only secreted when we sleep) happiness alone changes our rhythms, can switch us into parasympathetic response, raise our pH etc.
I tend to go back to the hermetic tablet, as above, so below. Our cells are a microcosm and lives are reflective of what's going on in our environments and vice versa. If you can achieve balance spiritually that will likely begin to reflect in your cells. If you can achieve balance in your cells then it will begin to reflect in your behavior and mental function.
There's no one straight path. I tend to think it's a little bit of everything that will shift things...one foot in front of the other.
This is not to say you shouldn't focus on the nutrition, the biochemistry, the systems etc. You certainly can and be quite successful in doing so. It's just one avenue, though and not a particularly holistic one. It will bring you a certain distance, but then the other aspects do need to be addressed. How is not set in stone. I do very well with flowers and homeopathy supported with CST. Others may do far better with acupuncture and rolfing. There's no one answer!