I'm sorry, if your only login system is Facebook, you can't access it another way at the moment. I'm sure that the Contact Team could help you in other circumstances to get your account back, but because the number of players without access is huge, helping one by one of them could expose some accounts and would take some ridiculous time to archive this task.
As soon as they have new intel, they will share it on their social media accounts, so be sure to follow them to know when this issue is fixed!
Remember, this lost time is really being considered by the DEVS, and so, they will give all accounts affected a "one of a kind" reward when you're able to play again!!