Was your child like this when he was in kindergarten? Seems like he cannot control his emotions and fear (which is normal for p2 kids), has different expectations of primary school and the teachers. I was a parent volunteer previously and have seen lots of such kids in p1/p2. Many of them are not used to the more restrictive environment in classroom setting, loud noises, more students in a classroom etc. Perhaps you can meet up with the school counsellor to see if extra help needed to guide your son. Your son is also experiencing the frustrations of not understanding certain topics, fear of being ridicule in class in front of his classmates when giving wrong answers etc. When he is calmer, explain to him it is okay to give wrong answers as no one is perfect. Perhaps you can also work with his teachers, ask ahead what new chapters will be taught in the following week, then go through the new unit with him. This will allow him extra time to understand.
Please also speak to your hubby and ask him not to continue such abusive behaviour, as that will worsen your son's behaviour. Stay strong and be well, your son needs your assurance and TLC to guide him through this period.