What is going on in my head/brain when I eat a lot of wasabi?

Ok, so I’m a huge fan of wasabi. I like to teeter totter the amount on my sushi. Small amount, large amount, medium amount etc and in no particular order. When bite a large amount on my sushi, what in the world is going on in my brain in the front with all that tingling? And how does it go from my tongue to my head? Is it a sign not to eat it? Is my body trying to reject it? Or is just what wasabi does? Haha. Thanks Fluther!