You can move on either way. Chances are you have a health problem, which is causing you to think of all this stuff. The way I see it that this is just your way to cope with it.If I just knew what I believed, then I could truly move on.
So what if you're dead or in an alternate dimension or whatever else. What is that going to change? You're still stuck here, so may as well live and stop obsessing about things that aren't going to have any impact on your life.