>Then how could a drug fix it?

Many things that are not necessarily caused by anything external can be fixed by drugs. I don't understand your point.

If the problem is brain not working correctly (because some organ is not doing it's job properly) then no sequence of words will make the brain physically fix itself, just like no sequence of words will cure a heart attack.

Of course it depends, and many people just need a correct therapy. I'm not dismissing talking and figuring out the root cause.