Ok the first thing is don't panic.
Ensure you have some food & water. Don't forget to ration these as there might be no more food coming.
Next thing to do would be go to your bank, withdraw all the money you can & buy as much gold as you can afford. Gold will keep it's value when cash inevitably becomes worthless.
Barter some gold for a horse. Barter some more gold for horse riding lessons.
Use your horse to ride to Glasgow, when it becomes lame you can kill it & eat it. Or maybe kill a cow. They probably taste nicer. I can't recommend riding a cow I doubt it is as fast as a horse.
If you manage to ride through the night, you might, just might make it back in time for your hair appointment.