Rage in a toddler?

My son has recently unleashed a fury like none of us has yet seen in a child. While propmted to see a psychologist a think a more permanent solution may be found in homeopathy, I welcome any comments concerning. A baby that was pampered at every whim, my son rarely cried as an infant, though he was very demanding. He has and continues to be breastfed at 31 months (2 1/2 years) I have spent most of his life by his side making sure he received lots of love and attention, even cosleeping with him. With another one on the way, I have had to make a full time return to the workforce. Two nights per week he is in the care of my mother with 1 or 2 other children, one of whom he has grown up with. My mother is reporting a rage and fury in him with tight fists and incessant scratching, biting, punching, kicking, screaming, and even trying to stomp on another child's head. This is a behavior which we have not seen before in him and are extremely perplexed by as we use time outs and make amends for wrong doings. He has had one spanking ever for letting himself outside as time outs seemed to have lost their effectiveness. As a 1 year old, I have also slapped his hamd for reaching for outlets. These few times that I have physically struck him is when he seems to become violent with others, children and adults alike. He has sandy blond hair and fair skin, he is slender but not rail thin, he has a healthy suppleness about him with out being stocky, thick, or dense. I have raised him a vegetarian, focusing his diet around cooked veggies and fresh fruits. He does not like bread or sandwiches. He loves bagels, pizza, broccoli, carrots, corn, peas, green beans, potatoes, grapes, apples, bananas, and pineapple. He does not like to be covered at night at all and he sometimes (not very often) whimpers or laughs in his sleep. I used to wake and comfort him if I heard him cry out in his sleep. He is very jealous, demanding, explosively angry, does not show remorse, screams often when angry, does not respond to time out, and refuses to apologize. These behaviors come in microbursts over the last week or two. He likes to pretend, he has a fixation on the ocean, he has an affinity for whales, dolphins, sharks, fish and mermaids. He loves to swim, loves the outdoors, laughs (he is very funny and likes to do knock knock jokes), run and participate, however, if he is not first in a group, he is likely to sit down and pout, he is also likely to be impatient and refuses to share. He has been accused of having a likelyhood toward ADD/ADHD. He is a very loving and affectionate child. Loves to cuddle and watch movies. He has not been vaccinated, has had yeast problems after antibiotics (amoxicillin, given twice) and was on anthelminthic treatment (mebendazole 1 daily for 3 days)for a hookworm infection in his foot accompanying a fungal infection in the entry site on his foot. This treatment was followed with an herbal antiparasitic protocol. That is all I have time for now, I invite comments from anyone with any advice as to how to handle this situation. Thank you for your time and God Bless.