I think living with a chronic lung condition, with breathing problems and acute flare-ups, would depress anyone, we don't need any other cause!
My depression got worse a few yrs ago when my husband had a complete mental breakdown caused by tinnitus & every day was begging me to help him commit suicide. My gp upped the citalopram to 40mg, gave me some valium & sleeping pills to help temporarily, and arranged counselling. I'll always remember him saying "don't hesitate to come & see me whenever you need me, I will always help you". Just him saying that, and knowing he meant it, was fantastic and helped me get through a very desperate time, & I was soon off the valium etc. With his care my husband has made great progress & I've been able to stay calm and stable enough to support him. So, bring on the drugs I say, I think they're fantastic and don't have the slightest qualms in taking them.