Your plant has tomato leaf fold and their are several problems that can  cause this. Insects such as mites, larvae or aphid cause leaf curl but you would also see holes the size of pin holes or eaten foliage and scat left behind. Another cause is lack of magnesium in the soil even if you did add calcium in the form of gypsum. If you used a complete fertilizer when you added the 10-10-10 plant food this would most likely not be the case. Make sure your fertilizer contains micro nutrients such as magnesium as well as the top three NPK. I use Osmocote on my tomatoes for just this reason. The third cause of leaf fold is related to weather. The new growth experiencing hot sun and humid nights or too little water when the leaves emerge can cause shrinking and folding of the foliage. Your plants will recover if the weather is the problem as the plants will adjust to warmer weather. I do see what looks like flower buds on your plants. If so then I suspect you will have tomatoes this season. The only bad news is that a viral infection can also cause leaf fold. If the plants begin to yellow and the leaves keep folding then suspect a virus and uproot and destroy the plants. I see not yellow in the photo so I am going to predict it is not a viral problem. Keep growing, Marianne Binetti