If this is your only account then I think nobody can help you here except Microsoft! In the future create a 'Break the Glass' account that you exempt from every 'policy' you apply that can affect the way you login or authenticate against Azure AD.
Make sure you create a very strong password (32 chars or above) and frequently change the password to keep it as safe as possible. If you want MFA on this account (which I would definitely recommend!) create a separate CA policy for that account and exclude it from all others. Test it and if it works don't touch it again ;)
Hope this helps you in the future, good luck!