@whahoo, I hope that as time goes on the fear of recurrence lessens for you. It is certainly an unknown, and your oncologist should be able to give you a better idea of what your future may hold. Knowing what happens if there is a recurrence may help.
I’m stage IV. I have CT scans on a regular basis, and I know that my cancer will recur. It helps me to know that when the cancer comes back we have a plan in place.

I had a Petscan with syed glucose which showed the lung cancer but nothing else. Petscan will catch earlier than CT scan. If you haven’t had a Petscan with the dyed glucose, you should ask for one as a baseline, assuming your insurance will approve and pay. It’s quite an expensive procedure.