If the wheels fall off Tuesday, a few days later they will be back on again. The market is always up and down, sometimes more erratic than others. Years ago I learned not to react to it, just keep a steady course.
That's not an easy thing to remember during the sever downturns that happen every five or ten years. Sure it's easy to look back and say that Mar. 09 was a fantastic buying opp., but in Feb. 09 folks were buying only to end up losing yet another 25%.