Welcome to NGA,
@Irina !
I'm not sure about this, but your photo reminds me of tomato curly top virus (
https://www.google.com/search?... )
Unfortunately, affected plants don't recover, from what I read there; I've never encountered that particular problem myself. Hopefully someone with first-hand experience will have additional information (or, I could be completely wrong and this is something else altogether).
Best of luck to you -- and, as an aside, it would help us to know where you are located... which can be added in your profile information so that it will show on the right-hand side of your posts.
