I accidentally used sweetened condensed milk instead of evaporated milk while making fudge. Help!?

Maybe you can make hot fudge sauce out of it. It will need a lot of cocoa powder to balance all that sugar. My hot fudge sauce recipe goes 1/2 cup butter, 1 1/2 cups sugar, 1 cup heavy cream, 1 cup cocoa powder, 1/4 tsp salt. Take out the cream since you've used condensed milk, and increase the cocoa powder by at least 1/2 cup. Boil that 3-4 mins until the sugar dissolves and adjust if it's still too sweet.

Without knowing your whole recipe, it's hard to say what's best to do now, but since fudge is already mostly sugar then I'm sure there is a way to make fudge from what you have. If you are making cooked fudge, I would just go on with the recipe as usual.

I'm interested in this as well

you're going to have some super sweet and super thick fudge, sorry, once added there isn't much can be done.

Make caramel sauce

I would try to use it in the same recipe. It may be sweeter and not get to the right consistansy, but it worth a try.

add some cocoa and make it into choc caramel sauce.

taste it.. it probably isn't too far off the original taste

leave out the sugar