Where was I?

I tried to sit up, but my arms felt like they were made of lead. It took three attempts before I managed to push myself upright, and even then the room spun around me in lazy circles that made my stomach lurch.

"Hello?" My voice came out raspy and broken, barely above a whisper.

No one answered. The room was empty except for me and the narrow bed I was lying on. There was a small window to my left, showing darkness outside. Night time, then. But which night? How long had I been ...