Sorry to hear of your health issues, but I encourage you to keep up the fight! As far as places to see, other than those you mentioned, I would plan on entering Yellowstone through West Yellowstone. See the Tetons if you haven't already. Definitely see the Natl Parks in Utah. They are beautiful and each is very different from the other. The other advantage is that there is lots to see without an inhuman amount of driving. Enjoy each day and don't push too hard to do it all. Take time to savor the time you do have and the sites you see and not worry about putting a check in each box on the to do list. Take care and Godspeed.