Acount email bug !

My account email,suddenly not exist . Everytime i open my acc i just click ok then go becoz i click already (remember password) . But this time i tried to login without using (remember password) thats mean i need to input manually my password i dont change my email its constant when i already input my pass and click go . Its saying my acc or email (suddenly not existing ) instead of saying wrong password or etc its saying not existing . Sts please fix and recover my acc