Does anyone know when the phrase "sixes and sevens" came into use? I've been looking for a phrase meaning "topsy-turvey" or "turned upside down" that dates to the mid to late 19th century.
Thanks in advance for any information you may have.

World Wide Words has an Q&A session on its origin and is probably a good place to start (link).

The prevalent 'urban legend' I have heard refers to a British game with dice. In this game, the rules all change when a Six or Seven is thrown.
I have no authority to which to point for this, though.

I have no authority to which to point for this, though.

Michael Quinion discusses it in the link I provided above.