If you recently logged back in and it looks like all your data went missing, please consider whether you have set up an account under another email address. You may also have set up an account via "Login with Facebook" or "Apple ID" in addition to an email address. It's also possible that your original account was created with a typo in the email and by logging in with the correct email, you created a new account instead of signing into the existing one.
99% of the time this heart-stopping moment is resolved by identifying the right account. If you need help with this, please get in touch.