The first problem is the tops are yellowing and starting to die. I don't think it is early blight because it is working from the tops down the bottom leaves still look good. here are pics.





The other problem is this. The leaves are curling & look kind of leathery.

Could be 'curly top' of the tomato mosaic virus. Here's a picture and some info. Also at the top of this page, click on Learn, then Article Library the 'C' and scroll down to curly top for an organic approach.

http://wci.colostate.edu/Assets/pdf/curly.top.virus.pdf

The other may be from too much rain, or overwatering. If possible let them dry between waterings but I would foiliar feed with a fish emulsion/seaweed spray or Garrett Juice.