There's a fairly standard sequence of events here. I explain what happened (you've been pulled into a different universe by a space-time warp that manifests as some kind of vortex) at which point I provide a link to a website describing the phenomenon in detail. [link].
Then you express doubt, I insist that it's true, and that the rules of your universe may not apply here. Usually when I want to drive that point home I shapeshift into a guy.
Then you wonder if you're alone, and I point out that people generally show up sooner or later from your universe and you'll be fine. When you got here, you technically replaced someone else. Check your wallet, you'll probably find some ID, a house number, the whole shebang.
Trying to remember anything else, but nothing's coming. Hmm. Well, there you go. I'm Jason Todd, glad to help you with your universal relocation.