Nothing wrong with caring about your appearance, nor wanting to feel comfortable with what you see in the mirror. We all know that its not helpful to worry about something that may or not happen in the future, but we do it anyway. Maybe the goal is not to stop worrying, but to deal with the worry a little bit better. There are a myriad of things you can do, and something in there is bound to ease the anxiety (even if just a little)...just need to find it. Since you didn't ask, I won't list them out, but Google is your friend.
To the question you did ask:
My greatest fear was dying on the table. When I woke up from surgery my first thought was "Yes! I'm alive!"
My current greatest fear is still also dying. After over 15+ years of being MO, I am so grateful to be in a body that allows me to enjoy so many aspects of life that I want lots and lots and lots of more years to do it.