Be carefull with the changing of the account currency.
It will copy all your ads to a second advertising account (inside your facebook account). All these new copies will be new ads, so they will be reviewed again and they start at 0 impressions. Your daily budget will be carried over to the new currency account.
Your old account will be paused completely (you can unpause everything) and your daily budget will drop back to $50.
+rep, that's fuckin nuts. But I would rather not have FB calculating the exchange rate for a non-USD account as they'll probably fuck you right in the cakehole on that one. They can't even calculate clicks, letalone currencies.