Very much yes; that's a part of the major depressive side of our disorder. Some go as far as to self harm to confirm to them selves they still can feel. I don't go that far (yet at least, *crosses fingers*) I use other means to confirm i still feel, which is more common, like crying from psychological pain, or perceived physical pain.

Or do you mean apathy where you just don't care, or cant care enough to care to feel?

This is a tough question to answer as there are many layers.

I've never experienced pure Mania, or Psychosis, but I have gone the other end very deep, and have become very numb. Even with my parents holding my hands, and telling me they loved me, i could not even fathom that to be possible. In the altered state of mind, it cannot process the very notion that an emotion can exist. I have even gone as far as dissociated from the stress of either perceived pain, or real psych pain, or stress in general from life, and sudden become numb from feeling. Again, altered states of mind, and tunnel vision.

Very complex stuff.