I am a UK ATPL who currently takes daily SSRI Medication; I fly for a small/medium sized UK based operator with the full knowledge of my Flt.Ops/HR Dept, local AME and CAA AeMC at LGW. I attend a relaxed, informal consultation at LGW every 6 months to update my condition. My only restriction is an OML, Multi-Crew Operations only.
My Employer, once I informed them of the issue, allowed me several months to recover and I cannot speak highly enough of positive effects of anti-depressant medication in my particular case. Yes, there were some sticky moments during my time off - I cannot deny.
HONESTY is the best policy for all concerned - to talk of being fired on the spot by HR is simply unfounded, scare-mongering and at best encouraging people to hide their issues even more