Posted 1/15/2016 10:30 PM (GMT -5)
I felt something similar when I had an MRI done. There was a lot of crawling in my brain, and just unsettling sensations, that weren't there to begin with, but developed and grew in intensity, as the scan went on.
I could barely keep myself from trying to break out of the machine, the last few minutes.
I wondered the same thing, or if it was due to heavy metals.