I couldn’t help but think of Zhuangzi reading about your dream. I’m sure other people have mentioned this. On dreaming of being a butterfly, was I a man dreaming of being a butterfly or am I now a butterfly dreaming I’m a man?
I’ve found on several occasions that intense, unexpected dreams as a chemical side effect can be troubling. But, then, life is a lesson mostly out of our control and we can, at least, learn the things we would rather not do again and why.
Hope your surgery is good.