Stop and take a look at your foundation. Your home depends on it. Take a look for Bowing Walls, Cracks in the wall, Stair Step cracks in the corners, and cracks in your basement floor. Additionally, look for things in the upper levels of your home. There are great indicators for foundation settlement and repair like sticky doors and windows, and if you get to the attic you will see tremendous stress on the rafters. In worse case scenarios, the house could be getting ready to tear itself apart.