I would look into Dr. Gabor Mate’s work. He was a doctor who decided to start looking at trauma, addiction and adhd. He himself had childhood trauma which imprinted into his body and he developed adhd. The Nazi’s were occupying Hungary and his mom was afraid he’d be taken so she gave him to a stranger to take care of him. He was a child and it was traumatic for him not to have his mother. He has so many talks and books which are very enlightening.