The trick for a lot of writers is to create a state of mind where you are not thinking about writing. Rather create a state of reverie, a dream state. Dreams are where other people escape from reality. But for the writer dreams are reality.
Madness string 1279
You're not crazy. This happens all the time. It's a really long explanation, but right now I would focus on getting your keepsakes back. Close your eyes, and envision your keepsakes wherever you want to find them. I assume there's a different closet now? It's likely in there. Imagine it, and then open your closet and they should be in there. As for the explanation, your consciousness traveled to a different timeline. Which isn't necessarily as problematic as it sounds, but it's still disorienting.