Doubling down is fine, if you buy 1000 shares of a $10 stock, and buy another 1000 at $5, if you start with 20k. You had plenty of capital to start with, right? I'm kidding, you should've gotten out before it got to 5. I agree with Redneck's first post. Get out. Take the hit. Step back. Re-evaluate. Many of us have been there. It f...ing sucks, but licking your wounds is better than staying in the battle and getting shot in the head.
Getting out of bad spread is first of all not entering into the trades which involves the currency pair which has very high spread. Choose the currency pair which you are confident of handling.