That depends on the change. If I got stage 5 cancer, I would spend time with my loved ones and travel. Eat whatever i liked. Toast the rest of my days before death.
If i won the lottery, I would for my closest friends & family relations, pay them 6 months salary, so that they could do somethings they have always wanted to do, but could never do because of finances. I would donate a portion to a charity of my choice, put money aside for my kids in a trust until they are 30. I would hire a house cleaner and cook..and my husband could quit his job and just coach.
I would remain the same as I am now, just worry free maybe..because you can't change what is and you can't allow things to control you.