[An] experience that began with the sensation of a switch being turned on in the physical centre of my head - that being the general location of the Pineal.
Very interesting, because I recall the commencement of a DMT experience wherein I had very pronounced interiorly perceptible and interiorly audible ‘click’ of something around the pineal region of my brain.
... a very real experience that I would describe as being 'in heaven' on earth.
Reading that makes me reminisce about a couple of garden based DMT experiments where the unexpected outcome was the elevation to a state of profound bliss. I can genuinely see why you would count such an experience as the most joyous day of your life. My reminiscing is making me yearn to further my research.