I was given a z pack and prednisone yesterday for severe bronchitis. Today I have some sensitivity below my right check bone just above where my gums might end. Is this just sinus issues or does it indicate I might have a tooth problem? Should I go back to first assist or let it go to see if it goes away?

It's your call. We can't diagnose online, therefore there's no way for us to know what's going on, or the severity of it. If you feel that something is wrong, you should see your doctor. It's really your call.