Speak for yourself, sunbeam. My thinking has changed quite radically since starting Lexapro and Buspar. I would argue that that is changing the cause, since I personally feel bad after thinking certain thoughts rather than "just feeling bad".The medication only masks the symptoms.
I'd been trying to change my thinking for 6 years via REBT, CAT and CBT with little impact. These drugs have changed my thinking. I would not call that "masking the symptoms".
p.s. where abouts in Wales you from? I'm a Bangor lad.