Post the pictures in a comment down here. That usually works.

That pot is certainly too small for mint!! But you don't want to plant it unattended in the garden either.....it will take over! Growing it in a container is really the only safe way to go, indoors or out.

Without a photo to clearly illustrate the problem, it is impossible to tell if your mint is salvageable. But IME, it is pretty darn hard to kill, even with overwatering. I would repot with a quality potting soil and a larger pot and see what happens. Mint is not really a houseplant and will do much better outdoors. But if that is not feasible in your climate at this time of year, you can keep on a bright windowsill until it is.

Pretty difficult to overwater mint to the point of killing it.. If you had multiple stems then it means it’s developed rhizomes already so you can be pretty sure it’ll come back up. Just pot into a bigger pot with fresh mix.

I have grown it in the ground unrestricted for many years, but it depends on your climate and soil type as to whether that’s a good idea. Like gardengal says, many people find it can become invasive.