I don't think I'd panic just yet. The Dow and the S&P were down about 3% today, but are still up for the year. If you own stocks you have to get used to the ups and downs. The important thing is to think long term and adjust your holdings to your risk tolerance, and be diversified.
The market is somewhat over valued right now in my opinion, so its possible it will fall more. Its painful when that happens but then again nobody cries when its going up. (Well except for short sellers and people who trade options
)