permanently ? no , reason why is because as long as you have test coming in , and test converts to E, then you have an unlimited supply of E .. but letro can crash your E real hard and real fast, and it will take time to recover your E levels . no sex drive so you prob crashed E , how much letro were you taking?
don't over worry crashed E too much . body builders do it going into competition all the time , its not 'permanent' and you will recover