What do you do when you're losing your faith, and your interests?

Lately, I’ve had no interest in writing, singing, or any of the other things I used to love.
I don’t even feel like going to church anymore. That used to mean everything to me, and now I have to force myself to go.
And I didn’t think about Asher (my friend who died just over a year ago) for a long time, and now I think of him all the time, and I started having nightmares about what happened.
I don’t even feel sad. I just don’t feel anything.
I don’t know what’s going on…
Please refrain from making this all about religion, because that’s not what it’s about, and I don’t want any arguments about it. Thanks in advance.