You do have a potential personal injury suit if you suffered an injury as a result of the cut.  Even though you have a potential suit, you will need to develop the extent of your injuries (physical and mental), to decide whether it is cost-effective to file the suit.  How much a jury would award for these two categories of damages will depend on the extent of each.  Consider visiting with a personal injury attorney to review the extent of negligence on behalf of the store, your medical injuries, and your mental injuries to decide if you want to go forward with a personal injury suit.