If you haven't already, you should probably get your head checked out. It's probably a concussion, but none the less.
I smacked my head really good a few years back, they ended up finding 'water on the brain'. Once they corrected that, I had my first awakening. Which was troubling and scary because I didnt know what an awakening was.
Before they 'drained the brain' I had the digestive issues you described, persistent and severe headaches, and the foggy, short term memory symptoms as well.