Had something similar happen, felt very anxious. Took a while to get used to that type of thinking. I believe that I grasped time/space, infinity, particles, waves, etc... thoughts a long time ago, it was beautiful and overwhelming at the same time. It's figuring out the mechanisms of all those ideas flooding the mind and interpreting the reality of the manifestations.
Don't be afraid to jump into the "scary" thoughts within, you're waking up. :)
Anxiety is only natural. Kind of like being born, not knowing where you are, who you are, or what you're doing there.
Increase whole, organic foods, and conutrients, it will even out the anxiety and make everything work better.