I just tried using the KOR whitening kit with trays I got from the dentist. I must have had a cavity or something because I am getting the most excruciating stabbing pain on and off. I don't even feel okay to drive in case it happens while driving. The tooth desensitizer that comes with the kit has not been helping. It's Sunday so all the dentists are closed. What should I do?? I'm not sure if I'm allowed to go to an urgent care center or the hospital for such a thing. But I'm not sure how I can make to the next day. Since I have no health insurance, I need the cheapest option. Help!