I also have some questions and comments:
1. What kind/variety of tomato plant is this?
2. How old is it (from seed to today – age)?
3. Have you changed the fertilizer solution (lately or ever)?
4. Curling of the leaves – seems like a minor
nutrient deficiency like Calcium deficiency.
5. Flowers are falling off – appears to be because of the day length (too short).
I agree with GpsFrontier, pictures would be great!