My iphone is asking to be activated agian Helpp cant reset icloud apple id

a glich in the system sent it to activation mode after mysteriously going into airplane mode last saturday. Now my Apple id that it was set up under I can not for the life of me remember my password or which back up email address it would send reset password instructions too. And it will not allow my Apple id that is associated with my icloud to unlock or activate my phone. What do I do