I agree with Frillylily that it seems odd such a moisture loving plant as Impatiens would go from healthy to death's door in just two days from overwatering. Since the symptoms of over and under-watering are so similar it's hard to diagnose the problem from pictures. The medium in the pots is pulled away from the sides which suggested to me that it was dry rather than too wet. I think in other posts Pamela has mentioned watering maybe only a half a cup at a time?
