My little crestie, Jake, died mysteriously a few weeks ago. He seemed fine, then one night I went to feed him and he was gone. I never even knew anything was wrong until it was too late. I could not afford a necropsy (I currently owe my vet about $350). It's possible this happened, but I guess I'll never really know for sure. He was not even 2 years old.
I am very sorry to hear of your loss, Mandee. It's always tough but even more so when the cause is shrouded in mystery. Rest in peace little Jakey.