Depression is a syndrome and has so many causal and exaserbating factors...were it a more localized disorder (e.g. diabetes) it would be far less difficult to treat...fortunately, there are new classes of medications and more refined talk therapy being introduced...just my two cents, and hope you are OK...J
for those that have had depression for extensive periods, it becomes their reality. You get used to it and comfortable, in a way. for me, happiness has started to become a fear. because if ur sitting on the 'rock bottom' you can't get any lower. but if you're happy, you CAN get lower.
i guess its a kind of emotional stability. I'd rather stay depressed, then happy and all over the place.