@elyser, I must be the exception, because I did not have a strong emotional response to my upper right lobectomy in 2018. The diagnosis was a shock. There is no history of lung cancer in my family and I have a LOT of relatives. But, despite the surgeon's warning to my wife and I that I WOULD be depressed after the surgery. Meh, not so much. Just one more thing to deal with. Our bodies are pretty amazing in what they can bounce back from.
It may have helped that I'd been meditating for 43 years prior, including a few months at the top of a mountain studying under a Zen master, but that's another story. For whatever reason, I've always been a positive person. Some people have scanxiety and others of us look at each scan as another opportunity to learn that we're still cancer-free.
7 years after the initial surgery, after metastasis to my brain requiring brain surgery, followed, years later, by a recurrence requiring radiation to my brain which again has made me somewhat physically handicapped, I recently did realize that I have some of the classic symptoms of depression, and I'm seeking a local therapist. But that's because I can't walk without at least some degree of pain, much less hike, garden, etc..
I should have finished with I'm quite grateful to still be able to do what I do. I hope you can find peace and the view that there's more good in life than bad.