In other words you got burned. Really bad. Immediately after you sold the price began to rise. A 100k wall came up and crushed your dreams of buying back at 0.0017. Don't be such a bad loser, learn from your failure instead and turn a profit next time.
Seriously, I am very happy and I sleep very well , do not worry about me..

I wouldn't say burned, because he didn't lost any money. The reward is rather low for this kind of risk though. Nonetheless, percentagewise it is an okay, but conservative, trade.
Depends on what you define as money, or losing money. If USD is what you consider money and you sold your bitcoins at $15 just before the rally to $266 with the intention to buy back at $14.5 I would say you got burned, even though technically you didn't lose any USD, it was still an awful trade.
Similarly if monero never hits 0.0017 again, he got burned on that trade.
Never, Polo-Monero have "solid" "walls".