I've had a similar feeling (or lack of feeling) at many times. And I think, in my case at least, a major cause of the apathy was that I was trying not to feel strongly about something else, something bad I did or something bad that happened in my life. And spending so much effort cutting off the feelings for those things led me to feel little in regards to my life. (Is this what they mean by the phrase "stuck in denial"?) And so much effort can be spent doing this, emotional cauterizing, if you will, that nothing worthwhile seems possible. But like anything we perceive, this is a filtered perception, and if we can figure out how to change our filters (believe me, that's what I'm trying to do right now!), maybe we can think ourselves out of the funk that we thought ourselves into. (At least, that's what I'm hoping right now.)