Psychiatry isn't even a science.
Wrong again.
It's classed as a "Soft Science" since it does deal with observational interpretation. Science as you should know was taken from the Latin word for Knowledge and considering a number of ailments are very fully documented you could say there is knowledge on that subject. Of course you'd likely say the same about the bible, however there isn't any observational facts, just metaphor's, conjecture and a whole bunch of stuff stolen from other precursor religions and societies.