Hi
I believe you need to address that, as it says something about your underlying perceptions.
I have never dreaded any surgery (or anything much since my usual floggings from the school principle at the Catholic Christian Brothers school).
Its inconvenient and its a bump in the road, but if you haven't started to suffer symptoms, or yet lost your health and had to fight
hard to get it back then you may not see this as being a the most wonderful opportunity you have had or will likely ever have.
Having had to fight for my health and regaining my health and fitness about 3 times in my adult life I dread the loss of it more than the second chance to keep it.
This surgery gives gifts well beyond the gift of a return to live before that failed part tried to kill you (slowly and unplesantly), it gives the possibility to reflect, to consider and to experience something truly outside of anything you've ever done.
Make the most of it, dig into some philosophy.
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I have lost good friends due to cancer, I'm on the way to losing another one. Take heart in this surgery, for its highly successful and really, compared to rounds of Chemo this is a cake walk.
some of my own philosophical ruminations
https://cjeastwd.blogspot.com/2015/09/denial-or-delusion.html
Best Wishes for a smooth recovery