No You will not loose those accounts..
All you need to do is, get back to their old proxies or which you used to login on those accounts, Then, FB will ask you about the last login attempt which was failed and raised verification mode,They will ask you like, " Did you Attempt this Login at this time .. : .. from this location (location detected through proxy ) ?
All You just need to do is, Answer "NO" ... And then FB will let you login to your account again without anymore verification questions.
But you Answer them as " YES " then You would be asked further more questions which are simply irritating.