Teleported somewhere random and lost inventory when loading world

I loaded up my favorite world, and I looked around and I didn’t know where I was. I thought I was doing some traveling until I noticed that my inventory was gone. I blame frantic, thinking that my world had somehow been wiped, but I took out my coordinates and teleported to where all my buildings should be, and they’re fine.
I have no idea what happened, because I couldn’t have died as I have keep inventory on and I slept in a bed. Please fix this, I had a lot of valuable things on me.