Life can be pretty unpredictable. Just when your life is going well and you think you have things under control, something unexpected comes along and upsets your best laid plans. Whether it's something minor like traffic or long lines at the grocery store or something major like becoming disabled or being diagnosed with an illness or disease, just about everyone can relate to having to resort to Plan B.
One more pearl of wisdom: it's how we react to life's minor and major inconveniences that makes the difference. I think how you handle problems really says a lot about your character. When minor annoyances arise I just try to remember that it's really not a big deal in the grand scheme of things. And when I've been confronted with major obstacles I just try to remember that those challenges are molding me into the kind of person God wants me to be.