I think motivation and wanting can be tricky and will go away and resurface somewhere else later, depending on stages in our lives and stresses/circumstances. When we have a major change, a traumatic (or even "good" like a graduation from school, a marriage, a baby, anything that changes you) experience, I think we are nudged into a different spot, we have to incorporate that change into our lives and then move on based on that change.

Think about it, if you have a baby, it is no good deciding you are going to go back to being like you were, doing what you enjoy, going out and partying every night? It doesn't fit your new situation.

If you are in a car or other accident and are paralyzed, you can't decide you are going to continue being on the school track team, win a scholarship to college in sports?

A traumatic experience gives us new, often difficult/negative information about our lives. We are less "innocent" than we were; we no longer think we can do everything or that bad things happen to other people but not us, etc. Our whole way of being is turned on its head.

I can see how it might have been comforting to keep just doing what you had been doing, hoping things would go back to "normal" but your normal has moved down the block four houses and you have to go there and look out that house's front windows and see what's what from there now. It looks strange and maybe even "bad" (a parents' divorce and having to live with a single mother who doesn't make as much money as both parents did when they were together; change of school, living situation, neighborhood, loss of friends, etc.) but realizing that circumstances are not particularly good or bad but what we make of them can help.

Not wanting anything is safe if what you had/wanted has been taken away; think about it, that makes sense, you don't want to want or it too could be taken away again.

When I was lost, I started very small. What would you like right this second. When I was alone and lonely, at the zoo, I asked myself that question and the answer was, "an ice cream cone" Start small and build again. Daydream and pay attention; read or watch TV/movies and pay attention to how those things make you feel. Tease out what you might like, both tiny things and bigger things. Experiment with no pressure on yourself (want to lose weight? maybe don't eat any ______ for one week and see if that helps; weigh yourself now and in one week) just to have fun.

If being busy isn't fun/helpful, drop some things. You can pick them up later if you decide you'd like to then. If things seem chaotic or empty, either one, simplify or add things one-by-one, deliberately, by your own choice. Pretend you are an empty house and furnish yourself or you are expecting a tornado/hurricane/tsunami and build a shelter/unsinkable boat to your specifications to prepare and see how it helps or doesn't, what needs tweaking, etc.