Hey Jules,
I just saw your message and had to respond before I turn the light out.
What you wrote brought a tear to my eye; your weary tone can be detected in your writing (or is that just me ;), and I remember what it was like. It still visits in fact; the anxiety was with me today at work. For me, another of the souvenirs post-illness. I am not fully cured mind you, I simply live with it; it's "managed".
The reason for the tear though was that yes, there is so much tiredness and frazzle, then there is chemo-brain too, and/or usually PTSD, simple talk is difficult let alone even the smallest of office politics. Things of work and all the petty details are so very insignificant, yet, you must put effort into making them appear not so, lest you're the next on the redundancy chopping block. Or so it was for me. I for one was on the cusp of a nervous breakdown for many years, a couple of decades counting the second bout of cancer in my 30s. I have passed over that cusp more than once too.
I really feel for you and understand how speaking up on this in anyway, is simply too much to consider. Maybe it seems relatively too small to worry about, maybe you just cannot get your words together, maybe you are worried about it coming out wrong or being perceived wrong, or many any number of other frightening options, it's just one day at a time to managing anything.
Sorry, I don't mean to speak for you Jules, I do know we are all different, some of our experiences though are similar and if yours anything close to the situations I encountered around struggling with work my heart goes out to you and sends you strength and support to find a job or career path that will offer something more comfortable and rewarding.
Sarah