Hi Jen,
I had my will changed and also had a living will and power of attorney drawn up prior to my surgery but my case was a little different than most in that my husband passed away suddenly just 9 days after my diagnosis. Facing extensive surgery and treatments and the underlying threat of the "unknown," prompted me to get moving quick. My husband and I already had a will (which was drawn up after the birth of our son) and were VERY outdated so in many ways this was a good thing(?). Although my son at the time was almost 20, I didn't want him to have to make any life decisions on my behalf. I think that would have been too much of an emotional burden. Sorry to ramble ... I guess my point is that it never hurts to be prepared and, for me, it gave me some piece of mind.
Hang in there - you're doing great!
Many hugs, Nancy