You don't get used to it so much that you learn to deal with it easier.
Yes and no, I'm new to 'this' world, but it's the same world that I once knew, before everything went to hell.
Aliens is a broad term, I've never met any 'little green men' or gray for that matter, but I have met people and creatures from other realms /dimensions as well. They think it's strange that we're not aware of other realms besides our own.
Don't apologize, it's nice to be able to talk to a fellow human about such things and not be thought of as crazy.
Get some caffeine and water, it'll help keep you alert and with you just waking up from a coma, there's the chance you may still have a minor concussion.