Oh, Anne, so sorry you are feeling this way; I hate the dead apathetica (new word, sort of reminds me of the name, Metallica, maybe we should start a group :-)
Usually when I have felt the way you describe, it has been a bit of a "rest" from harder feelings or too intense feelings or feelings I've had too long that haven't resolved, etc.? Eventually it does morph into more "natural" feelings but waiting or wishing it would hurry can get old.
One thing I like to do with my feelings when they aren't what I would "like" is tantalize them :-) I go to the grocery store and tell myself I am to find THE one item less than or equal to $10 (or any price) that I would like in the store, for myself. I use to live near a flea market/multi-table antiques center and use to play it with that too; go look at a zillion things and find the one that "called" to me in some way. Or, if I'm really depressed, I'll make myself decide what I really "want" at that moment and then go get it for myself (was at the zoo, alone and miserable/depressed, and played that and the answer was an ice cream cone only it was 30-40 years ago, on a Sunday in a city with no ice cream shops I could identify near enough so I ended up going to the grocery store and "making" my own -- took me several hours and by then the mood and my interests had shifted).
Other times I just grab an interest and start following it across the WWW for several hours? Sometimes I get a bit of my mojo back, a new idea or interest? Since mojo comes from Hoodoo, why not start with learning about Hoodoo (I was clueless)?