I understand what you're saying about the ODD stuff. Honestly, I think it's a mystery yet as to the origins of ODD behaviors. So much more research is needed in the area of disruptive behavior disorders. When a child presents with such strong and unusual characteristics at a very young age that persist throughout childhood and beyond, one must certainly tentatively conclude that there is a biological basis for the behavior problems.
Both of our boys have ADHD and ODD symptoms. The symptoms have been present from birth in the form of difficulty with activity level, sleep-wake schedules, colic, agitation, and difficulty with self regulation. ODD does seem to accompany other comorbid conditions, but in all cases? Maybe not. However, I am still convinced that persistent symptoms throughout infancy, childhood, the teen years, and beyond, certainly point to a biological component.
Maybe someday we'll learn more detailed information about brain development and behavior disorders. The problem is that society fails to acknowledge the influence of brain disorders on behavior in so many cases. People seem much quicker to point a finger at parents and discipline issues than to consider the impact of neurological differences on behavior.
Regardless of whether ODD is a standalone condtion or not, I believe there is always hope.
In cases where another disorder can be identified, medications for that disorder may ease the ODD symptoms. Both of my boys have ADHD, and the ADHD medications definitely curb the ODD symptoms to some extent (not completely, by any means).
My younger son has an autism spectrum disorder, and he recently started taking Intuniv, which seems to act as a mood stabilizer in children. It does help. Again, nothing is really a "magic bullet".
If I were you, I would start tracking your child's symptoms in a journal. Note the dates and times of the disruptive behaviors, along with any precursors or situational factors, such as setting, foods, sleep, and people involved. Eventually, you can analyze it for patterns, and maybe it will even open doors to the details of his behaviors you hadn't considered previously.
Consider a full neuro-psychiatric evaluation by a team of professionals. They should look for developmental and medical causes, mood disorders, ADHD, sensory integration issues, allergies, and autism spectrum disorders. The sooner you get some sort of intervention, the better. We're presently getting our youngest son in-home autism therapy services, and it does help to have someone other than Mom and Dad do everything.
I understand your situation. I hope you find some answers.
(((hugs)))