Hi I can understand your difficulty as a mother, naturally every body will feel frustrated. I appreciate your hard work in managing both family and work life. there are few things you need to understand : for any child, both the parents will play a different role and relationship is required. before this husband and wife should have a better bondage to give positive nature to the child so that it reflects the same, in which we call parenting skills. for every step child should be taught right and wrong along with briefing the reasons. it might be related to behavioral issues or other. there are many reasons that your child is behaving this way, it might be biological (growth spurt) or lack of emotional support from both the parents. so please first both have to approach Psychologist or counsellor to handle your son in better manner. obviously he also need counselling. Please take care. stay positive.

Though you may feel you are not directly  responsible for your sons behaviour,  there could be reasons for it. He is like this not  just,   all of  sudden  right.

There seem to be interpersonal issues going on between you & your husband. Both of you seem to be blaming each other for your son's behaviour. Instead of doing that you both need to work as a teamto solve the problem. The parenting techniques adopted by both of you need to be assessed. Boundaries need to be set for the child if he is hurting you physically. At the same time, the reasons for his behaviour needs to be assessed.