Would you let them know or just take the hour?
I've got loads going on atm, which work know about and have been very supportive of. A very stressful time and I'm not sleeping very well.
I've done a good mornings work, but have come over feeling really nauseous. All I want in the world is to lie down for a bit.
I manage my own workload and I doubt anyone will notice, but would you tell them?