Sensitivity/Maybe Cavity?

Currently 20F, I’ve had fillings in my bottom left and right of my mouth (about 3 years ago) but recently on the bottom left of my mouth I’ve had terrible sensitivity to cold stuff. It’s specifically in my 2nd to last molar, I can see that I’ve gotten sealants on my last molar but the 2nd molar I’m talking about right now has either visible filling or a visible cavity along with a very small but very shallow hole I think. I can’t really tell which one it is
YES I have an appointment in 2 weeks for it but I just want to get an idea of what it could be. Maybe my sealant just got worn out? But I’m not too sure. The sensitivity just started this past week and it comes with a sharp pain with cold foods. Any ideas? Or advice before my appointment?