Hopefully, it's under warranty. Call Sears, they will know.
Mine did some same thing and the repair guy had to replace a motor in the freezer. Is the back wall of freezer frosting over badly? Is there water starting to leak either inside freezer or on floor?
My repair guy had to defrost it all with a high powered blow dryer. Then replaced a part, a motor, I think. They knew what the problem was as soon as I described what was happening.
It would have cost about $200 if my warranty was not still good.
I'm afraid you will have to call Sears and have someone come out. Leave it plugged in so he can see the problem in person.
I put all the food I wanted to keep in a cooler outside, it was winter, thank goodness. You need to take all your food to a neighbors, friend, or family. There is nothing you can do and I am sure it is the same problem mine had! Sorry about the bad news, but you need a new part!!
Good luck!! OOOH, and on a weekend, hope it's still under warranty!!