Depending on the healthcare company that you and your husband have, your husband might have to see his doctor on more than one occasion in order to get the correct diagnosis.
He might have to request another visit with his doctor in order to get them to look deeper into the situation OR he might have to get a second opinion from another doctor.
He might have to request a referral to a specialist if his doctor is not able to find the right solution for him.
This behavior sounds like it goes above and beyond Anger Management classes and that maybe further exploration into other available treatments, i.e. medication is necessary.
All that I am saying is to not let the doctor's simple solution after a verbal interview to be the end all and be all.
It sounds like the behavior needs a second look by a medical professional. Doctors dont always catch the solution on the first try.