(adsbygoogle = window.adsbygoogle || []).push({}); I am gamesharing with someone but what if he changed the sign-in email then how can i recover my account ?

That's the risk with game-sharing on PS3 it's safe but on PS4 it's not... but I believe you can change your password now and if he were to want to access private information such as your email... he'll have to enter your recent password. Other than that you can contact Sony but must give proof that it belongs to you.