I have 5 kids, the youngest who is 16 and the oldest who is 30, so I know exactly what you mean. Fun with friends makes life worth living :)
You need to just do your best to take your mind off of this for the next few weeks. The new batman movie is coming out soon so that will help :) otherwise, just know that you are in good hands and everything should be OK.
Also, nothing is written in stone. If you want to cancel the surgery you can do so up to the moment they put you to sleep with the anesthesia -- you are, truly, the person with complete control so...no need to worry :)
Let me know how things turn out. And, remember, I am here to answer any questions you may have or even if you just need to blow off some steam ;-)
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