Welcome, Ranger, sorry to hear about your situation! And you are right, this too shall pass! We share something besides the cancer, other than which I am the healthiest person I know. I haven't had so much as the sniffles in several decades.

I do have chronic sinusitis because 1) I'm allergic to cats, and have lived with one or two for the past 34 years; and 2) I'm allergic to Oak pollen, and have lived surrounded by Oaks for longer than that. But other than remembering to take something to blow my nose on, it has no impact on my life.

Be anal about getting 2500 cal/day inside yourself, along with at least 64 oz of water. Most here recommend a min of 48 oz, but 64 is better. Constipation is a major problem with most chemo varieties (although for some, the problem is exactly opposite - go figure...) and water is essential both for lubricating the intestines and for metabolizing and excreting the chemo.

If/when you begin to feel anxiety or fear, examine what you can do, and do everything you can think of. At that point, realize that all you can do is all you can do. When you've done it, let it go, direct your attention elsewhere and do not let your mind dwell on the fear.

Good luck, Ranger!