I'm sorry to hear about the recurrence. It's pretty much standard work up to have a chest x-ray, CT, PET-CT from the cancer diagnosis, and stage. Although my cancer was in the oropharynx, with local regional metastases, I had 7 recurrences in four years, and had to go through just about the same diagnostic procedures for each as I did with my first cancer in 2009. I tried to keep busy, and read extensively about my planned surgeries, and treatments, which may have helped with fear of the unknown, at least for me, and otherwise tried to relax, listen to music, zoned most everything out, even the mail sometimes. pumped myself up, and stay healthy.
Good luck with everything.