Fudge Recipe Disaster

So I wanted to make fudge today for the holidays and I remember my Grandmas recipe being the best. I called my Grandma to get her recipe, wrote everything down and then went to the store to buy the ingredients. Back home I do as the recipe saya. As I am trying to boil the sugar and condensed milk it just keeps getting thicker and thicker and will not boil. Soon it looks like brown sugar, crumbly, dry, and thick. I call my Grandma back and she had told me to use the wrong milk. The recipe was suppose to have evaporated milk in it, not condensed milk. So now my pot is soaking(hopefully it's not ruined) and I am contemplating whether or not to go back to the store today.......what a bummer! All I wanted was a nice piece of chocolate fudge!!! At least I have learned my lesson about fudge :)