I think I got my fear now into words:
How do I know when I wake up that it is real?
I mean, what if I "wake up" but its not a real wake up. Its just my mind manufacturing a reality to please itself. Like I just start living/recovering from the surgery but really I'm still asleep, or in a coma, or dead. This is what I'm afraid of. Waking up but not being awake.