Buy food (grains, beans, water, etc.). You can't eat gold!!!
And plenty of items to help you maintain self defense and the defense of your property and loved one!!!
But you can trade it for food. Still, you should have food to get over the initial "fall" and gold to get you well into the eventual recovery.
Guns and ammunition, lots of ammunition which can also be traded for food and other stuff, would also be a Good Idea.
Silver might be good for "small purchases".