Phew, that sounds pretty serious to be honest! If your car pulls to one side when you brake, it's most likely a problem with your brakes or suspension, and yeah, I'd say it's pretty dangerous to keep driving like that without getting it checked first. Since you had an accident a few months ago, it could definitely be related, so I'd tell you not to wait any longer and take it to a mechanic ASAP so they can give it a proper inspection. It's better to be without your car for a few days than to risk a more serious accident, seriously!