MLP's like NS should not be traded. They are long term investments. I intend to die owning them so I use days like this to add to my position if I have the cash. I know it's hard to see your portfolio go down in value but I believe it will eventually recover. In the mean time, unless you intend to sell or buy, quit watching the price and enjoy your distributions. Remember, the price only matters on the day you buy and on the day you sell.