Obviously I sympathize, but I find it extremely odd that OP is complaining about cards being declined but doesn't once explain whether he/she tried phoning their credit card to unblock? Because that generally works -- you call once, let them know you're traveling and where, and then your card works fine. Occasionally you have to call again for a specific high-value ($500+) transaction, but it's rarely more than a 5-m…
So I did an instant transfer to another bank account and used its debit card without a hitch, as usual.
Some banks just won’t let you use your money as you please. Your luck is in finding a bank that does.