I'm about 5 hours northwest of you. We got to -8C last night with some wind. I'm talking myself into getting out there and starting the day.
You've had a really hard start, even with losing one I'm so happy they both came to you, he at least was loved and looked after in the end. Sophia is now going to have a great life thanks to you. Get the vet visit over with and you can relax and enjoy.... and you will enjoy, they are wonderful to have around.
It's possible Jasper has lice. It's more common in donkeys and stress will have it flair up. It's no big deal to treat and doesn't pass to people.
Please keep us posted on how you're all doing?