You would be liberated. It’s established in Roman law that unlawful sales of freeborn citizens were legally null and void even if the enslaved person had been wrongfully enslaved for a significant period of time.

Assuming you aren’t killed in the chaos of taking the city, of course.

It all depends on to whom were you sold.

For what it’s worth, no answers yet for this question on the Reddit thread.

Depends entirely on what your name is and how much money is behind it.