Well, following my post last night, my husband had the great idea of asking the agency for a lie-in today and what a difference it's made! I reckon I will still need the antihistamine but getting enough sleep and waking naturally are clearly key. It just goes to show how the simplest things are often the most important and we need to build on it.
We've got a lot on this weekend and I was worried that much of it would have to be cancelled or at least compromised but I'm hoping this is what I needed to recharge and carry on - albeit carefully!
And hurrah to finding chilled coffee at the supermarket which also helped. Especially with it being Seattle coffee.