Wow. Some of the scenes that you described I went through with my son when he was around 8 maybe 10, stopped and started up again at 16, 2nd time I nipped it.
His father and I separated before his 2nd birthday and I remarried when he turned 6. He has had a loving relationship to this day with his step father however it has not been very well with his biological dad. He would throw fits and I tried to stay strong but I would give in to keep him quiet and for me not to pop his leg right then and there and then have him scream and then someone turning me in for child abuse, which it would not have been.
His bio dad has a hair trigger temper and it's all about him and during that time when my son would have these fits I saw his bio dad's temper.
Anyway, my son saw a therapist to talk with and it turned out that he wanted his bio dad to be proud of him, call him and his bio dad truly wanted nothing to do with him even though he refused to give up his parental rights (control issue) so his step dad could adopt him. I had to stay strong and had to come down hard on my son to show him that he is truly loved but he is NOT going to treat me the way that he did. He finally came out of it and then when 16 rolled around...it was about I need to date, I need a car, I need, I need, I need...what it truly was...was I want, I want, I want....so this age may not have had anything to do with the other attitude.
Because my son was being rejected by his bio dad to a certain extent his anger and agressiveness was being aimed at the other parent and put on the happy smiley, nothing is wrong face to everyone else. So if I said something to my mother she would say, well that can't be true, he is such a sweet young boy. Augh.
Would you be able to take your son to counseling and yourself as well? Most kids will tell complete strangers what bothers them before they will tell a parent.
You are not alone and I hope this helps in some way.