Unbelievable choice

So now I know why a part of me had my reservations about celebrating my results yesterday.  I kept thinking- I just need to hear it from the oncologist before I can celebrate.  And instead I was told that statistically there is at least a small benefit (up to a 5% increase) to my survival rate by going through chemo based on my situation, but that the decision was mine to make.  And so the waterworks start yet again as I can't believe what I am hearing.   How do you make a decision like that?  My life is amazing-of course I want to do anything possible to live the longest and healthiest life I can.  To get rid of this cancer as completely as possible.  My chemo starts Tuesday.  What would you do to add more time to your life?  Do me a favor and just do it.