The SSRI did make me more functional. But what it mostly did was make me affectless. That is, I could be sad or happy or angry or whatever, and I felt pretty much nothing. However, I still did whatever someone who was sad or happy or angry or whatever would do. You could say that it made me sociopathic. But fortunately, not homicidal or suicidal. Or at least, not in a big way. Also, I lost interest in sex, and it took forever to reach orgasm.
And yes, quitting was painful. Mostly I recall restless leg syndrome. I would kick my partner while asleep. And I got even crazier for a while, as I tapered off.
So now I'm taking modafinil and lamotrigine. Which works very well for me. I'm a little manic most of the time, but I like that. And I'm not at all sociopathic.