You're very impressive Holly ... very impressive. Being a store manager is not a small accomplishment. You've already shown that you can do this. Is it possible to take a little break if things start to pile up? Is there some kind of "treat" that you can take with you to indulge when you need a diversion? I don't know what would work for you, but I know I've had the same feelings, and I'm usually way harder on myself than others would be.
But ... congratulations on the return to work and the great job!
Trent