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"Last question if you don't mind me asking, will i lose my miles if I cancelled the cc (barclaycard US airways mastercard)?"
No. But hasn't your Barclays US Airways credit card already been converted to an "Aviator" card that earns AA miles? If you close the credit card before you redeem your miles, you will not qualify for the 10 percent rebate on award redemptions.
Also, flights from the UK to KTM will have significant departure taxes/fees. If you can depart from another European country, fees should be lower. And if you'll be redeeming 20K miles to fly back in Coach, you have a few carriers to choose from, not just Etihad.