8 years old with ADD symptoms

My 8 year old son seems to have ADD. He is very intelligent, very good in math, reading fluently but makes careless mistakes. He needs several reminders to stay on task. During quiet work time in school he starts making sounds and sometimes starts playing drum on the desk. He gets obsessed with one topic and will keep talking about the same. While in Kindergarten he came across a book about the titanic and since then up until last year he was so obsessed with it. He would talk about it all the time and would always draw titanic in his drawing book. He knows every detail of that ship. These days he is all about mine craft game. He can be hours on the Wii playing mine craft and after leaving the screen, he will keep taking about it. If he is sitting quietly and we ask him what is he thinking he will say that he is thinking what to do next in mine craft. He gets very loud and aggressive when asked to turn the screen off when the timer goes off.
He does not care about the authority figures especially at home. In school he will listen to teachers. He usually blames others for anything wrong happen to him. He is very shy so does not have a lot of friends. Although in class for group activities he engages in conversation and is always able to find a pair to work with but during lunch time he wanders alone. He is very mischievous at the same time, gets physical very easily. Cannot keep his body to himself. Does not care how he is dressed up, whether shirt is properly done, one side pants will be tucked inside the boots other will be out. He is chubby and loves to eat sweets. Cheese, yogurt, milk, bread, egg, tofu are his favourite foods to eat. In fruits only eats apple and banana. Will not eat any raw or cooked veggies. His sleep is good but usually wants either mom or dad to put him to bed.

I don't want to put him on allopathic medicine so just wanted dome help if any doctor on the forum can advise me which remedy I can try for him.