OMG I have the same questions.
I was on antidepressants post breakup, I was able to function normally, but I also did not feel much at all either. The thing is that I had no counselor or therapist guiding me, that is essential IMHO!
I do not know the answer either but now that I have to switch therapy I will ask the new therapist. In my case I feel I can be enthusiastic and apparently live a normal life, laugh, etc but very quickly I go back to bad mood, APATHY beyond anything else, start to feel life is not worth it and scary thoughts like that.. going "what for?" as if nothing is worth the effort even if its something I enjoy.
Its as if I have to do much effort to feel great, and I wake up feeling down, even if there is no reason to, as if I am missing some serotonin or whatever...
I believe only a therapist good be able to tell what´s convenient for you, personally...