I have these same two problems.
Calcium and Magnesium deficiency. The curling up leaves is calcium and the chlorosis there at the top of your plant is magnesium. This started happening on my tomato plant after it started to go to fruit.
People make CaMg supplements you can try to clear this issue up. Definitely check pH after adding them.
I'm hoping to resolve my issue this weekend by doing a water change using distilled water. I got the consult from a grower that knows a lot more about hydro than I do. I'm a newbie.
There are probably diseases that do that too but I'm pretty sure this one is a deficiency issue. Ask an expert
