Hyperactive child. Drops? will it help?

My son is 2.9 yrs old . Hyperactive. In every situation he started to cry like anything. Too much arrogant. If he felt asleep in evening and if we wake up him forcefully after 20 mins or so he will start crying . My doctor last year prescribed me zincovit drops . Last year after using 3 months I stopped. But recently he becomes picky eater so I started again. But in night time he feels unusual hunger. Is it good ? In dinner he easts 3 breads with rice and veg soup. But before using zincovit he eats rice and veg soup or fish curry. Weight of my son is 11.9 kg . What to do? One of my frnd told me use DHA drop . Bcoz this helps his son to learn so fast and decreased crankiness. Can I use DHA drops? Will it help?