"Passion is passion"

While reading "Dear John" (amazing book, by the way), I read a quote that really got me thinking:
"Passion and satisfaction go hand in hand, and without them, any happiness is only temporary, because there's nothing to make it last"
Passion...what am i passionate about?
All through school, it was singing.
I was so passionate about singing and performing and while I still thoroughly enjoy singing, i'm not going anywhere with it.
So, what's my driving force?
Well my husband is, of course.
but what is that hobby or thing that i'm passionate about? do i even have the capacity for passion anymore? I gave seventeen years of my life devoted to singing and now that that passion has died down, what is there?