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Ice is better than heat for an acute injury during the first week. Most people stop icing after the first day or two unless they're very uncomfortable. No longer than 15 minutes at a time with a hamstring. If it were a toe or a finger, no more than 10 minutes as cases of frostbite have occurred. Always a good idea to place the ice in a plastic bag and place layers of paper or cloth towels between the bag and the skin. Remember RICE - rest, ice, compression, elevation. Generally 15 -20 min is maximum for icing an injury.
It is best not to store Dry Ice in your freezer because your freezer's thermostat will shut off the freezer due to the extreme cold of the Dry Ice! Of course if the freezer is broken, Dry Ice will save all your frozen goods. Commercial shippers of perishables often use dry ice even for non frozen goods. doubt that you can pack enough dry ice into a cooler to keep that much food frozen for a week. I would recommend that you buy cakes of dry ice rather than pellets and take a second cooler filled with dry ice to replenish what evaporates.