Hello
I'm sorry, this must be a confusing time for all of you.
I have battled with these out bursts for years, despite engaging in so many psychological remedy as I possibly could.
It turned out after years of struggling I ended up fitting. It was almost like my body was too full of adrenaline.
I fought to understand and was eventually diagnosed with hyperadrenergic pots. ( your adrenaline levels rise massively on Standing) There may also be an increase in blood pressure during the tilt test.
This is a comorbid condition with ehlers danlos syndrome.
Is your son hypermobile?
Hope this helps in some way.
Dont give up
Michelle