My daughter was 5 when she started off with OCD then moved to stages of ODD. Today she is 18 yrs . To be honest in my personal experience there is no effective treatment or medication. The only thing we can do is get to a point of comfort & control . It’s always very challenging as the moods and their emotions are unpredictable. Most of the times mothers and siblings are the victim.
On lot research all I could gather is fireman approach and handle at the root. Calm / divert / relax the child before situation errup.
God bless all ! We are in the same boat these special angels aboard!