Linda, I think it's possible the problem is those peat pots you have them planted in. I hate those things, and for plants that put out deep, vigorous roots, they totally block the new roots from forming. The peat is most often packed too tight and too thick for the pots to break down fast enough to let the roots grow through.
I would tear off those pots and transplant them to some bigger, deep pots with fresh potting soil. Or if the weather forecast is good, put some of them right into the ground.
Don't forget tomatoes can be planted much deeper than they are in their starting pots - all those little hairs on the lower stem will form more roots. So plant them at least 2in. deeper, in rich soil and give them a feed of half-strength soluble fertilizer.
Good news is, it's really hard to kill a tomato plant. They probably aren't goners. But take off those peat pots for SURE!
