How long will you be in Slovakia? Aren't they candidates for joining the EU soon? Then you would be paid in Euros and be able to use and pay off your credit cards again.
I know that it's pretty hopeless there for natural remedies. Most ills are offered mineral water.
Just perhaps you can take a trip to London and buy some items to help you through. I also have heard that there are ayurvedic spas in Vienna, and that's closer still! So you might be able to get supplies from there. Perhaps you can find some of these spas on the net.