Stalling

I have a 2006 Hyundai Santa FE. Today I put wiper fluid. power steering fluid and 2 quarts in. About an hour or so later I was driving to work, stopped at a red light when the car just stalled. All the lights on the dash board came on. I quickly threw it in park and restarted and drove off. A few minutes later I got onto the highway. I had the gas pedal completely to the floor and would not accelerate. I was able to pull off to the shoulder of the road, where I shut the car off for about 5 minutes then restarted, and was able to continue on to work with no trouble. I get off work in a few hours and I'm scared to death of what might happen on the way home. Anyone have any ideas or clues as to what may be going on??