I know the CAA regard anti depressants as having the effect of depressing the alerting system and being a contributory factor to mistakes / accidents although I am partially lifting this from airworthiness notice 47 which applies to certifying engineers but I would imagine they take a similair line with flight crew, not sure if they would list it on their website, I think its
www.caa.co.uk, good luck and I hope things start looking up for you..