I emailed, finally got done with it by 4am, resigned myself to no sleep and then my boss let me know not to come in as something's come up. Serendipity
You know what though I couldn't believe how much calmer I felt after writing and sending it. I expected to feel slightly grubby and a bit frazzled - it was the exact opposite. I feel cleaner, and lighter, and less...broken on the inside, I think.
Thank you for your support and hugs