I'm a US expat living in Czech Republic...should I convert?

ALL GO UP AND DOWN -----IF YOU TRADE JUST BEFORE ONE GOES UP YOU CAN MAKE MONEY-----OR LOSE DEPENDING WHICH WAY YOU TRADED . IF YOU HAD TRADED ALL YOUR U.S.D. TO EUROS JUST BEFORE OUR DOLLAR TOOK A NOSE DIVE YOU WOULD HAVE MADE A PROFIT -----WHEN YOU GET INTO THIS YOU NEED TO STAY ON TOP OF IT AS IT WILL CHANGE FAST .