There used to be a provision for out of country visitors to reclaim the 13 % tax, but it may have been removed to fund ?????, but I think you need your receipts to verify your claim. Something to check out if you have to come back again to look after your Mom.
As others have said it is a learning experience and you are at one end of the curve. Take a deep breath, possibly an adult beverage and remember the best retiree line I have heard, "I woke up this morning with nothing to do, and I only got it half done by bedtime."
Once you have everything where you want it to be it will be much easier to keep it that way.