I felt something like that when I meditated for a long time, except it was more of a buzzing sensation that was on the top-rear area of head. I also felt a feeling of intense focus and confidence, like everything I did was right and really smooth.
I was watching the youtube channel Big Think a few weeks later where they had a guy on there named Steven Kotler and he talked about this phenomena he's researching called "Flow" and he described everything I felt.
People can sometimes enter this state while doing an activity, where the brain's calculation activity goes from the pre-frontal cortex to the rear of the brain (the part that deals with the subconscious) and its almost like they gain super-powers but it's just the brain entering peak performance.
So while maybe it's not exactly what you experienced it was similar enough that it reminded me of when I had my own weird little brain trip.
Here's a link to the video in case you were interested
"The part of the brain that separates self from other is shut down so you can no longer distinguish between the two things and as a result we feel one with everything"
That's fascinating. It's incredible what our brain is capable of doing, actually what WE are capable to do with our brain. I believe that what science knows about the brain can be compare to knowing only the tiny tip of a huge iceberg. Good to see this guy diving into the misteries of our brain to seek for more plausible explanations for us. Thanks for sharing your experience, it is a little different that mine but definitely related. ;)