Toss them. Sorry to say it, but to prevent myself from getting attached or upset over a loss such as yours.. Grow a few extra plants EVEN if you dont have room, I now always have a few plants I leave on the Outskirts / edges of my lights.. I figure if you have 2-4 more plants then you intended you wont be upset when one or two die, or just dont yield what you were expecting.. Its nice to have 8 plants that are cluttered than 4 Beautiful plants that your emotionally attached too.. cause when one goes south! its that much harder..