Should not have logged in via Facebook.
Did know it would destroy my data.
And start me all over.
Help! I know you can fix this.
Todoist doesn't have an option to use Facebook login, but if you're referring to the Google login then it's possible that this might have created a new Todoist account, but none of your data has been deleted on the previous account. Please try to log in manually using the email/password combination as you did when you've signed up and all your tasks and project should be available on this account.