I've had a weird toothache for the past few days (left side, one upper, a couple lower) and I thought it was maybe due to switching toothpastes, because I have sensitive teeth. But I started noticing a weird, almost numb, feeling in the upper left side of my lip. I plan on going to a doctor tomorrow afternoon when I get back home, but I was wondering if what I'm experiencing is something to be worried about and if I should take immediate action. Emergency room, etc? Or if there was something I could do now before I see the doctor?