When my computer glitches, e.g. if a key stops working on my keyboard or the mouse doesn't respond as expected, I sometimes experience a physical sense of of discomfort or disorientation that's not unlike dizzyness or the feeling of missing a step on stairs. I think it's because, as you describe in terms of immersion, my brain has extended its concept of my body through my typing fingers to the computer screen, building a proprioceptive loop which includes the computer.
We are already cyborgs.