Great summary and explanation, and I agree wholeheartedly! I believe that ADHD is simply taking in more stimuli than the "average" person, so they are "distracted" by things that "normal" people aren't, so the distracted person is looked at as abnormal.
I believe this because I developed "ADHD" (or symptoms of it) at age 34 (after my spiritual awakening, which included a heightening of my senses after "grounding" and clearing a blockage in my internal energy flow). I felt (and still do) so distracted by things and like I can't handle much "doing," and my brain feels scattered by all my thoughts and everything I'm trying to take it from my environment and what I have to do and what the world expects of me.
Try to explain that to the psychology community...a "child illness" first experienced in my 30s (well, actually, I think I first started to notice it when I was 18, when I was having a "nervous breakdown," though I didn't have the insight that I do now and I was quickly put on medication that took those amazing, heightened sensations right away), where there is no ADHD in my family.
I see all these "mental illnesses" as signs of psychological awakening to the world. ADHD and HSP is the natural state of a human's mind. I realized this last night while I was out walking the back roads. I realized that back in the day, when all these people and cities and buildings and roads weren't here, humans really had to key into their senses - for survival. They had to listen and pay attention to their environment - all the time - to travel, to hunt, to avoid hurting themselves, to avoid being attacked by other living things. They did not think as much as we do now. Now, most people think about everything in an imaginary sense, so they miss out on what's going on around them, so they have not been using their senses, so their senses have dulled (they have lost their natural "gifts" and "abilities" that we are re-igniting).
I also realized on my walk the reason I'm so overstimulated by the stimuli. It is because my ESP (extra sensory perception...though I believe it's not "extra," it's normal or simply heightened compared to most) is over-bombarded by everything in the environment that is not natural (like flashing lights, loud noises, crowds, etc.). It's too much and overwhelming to someone who has more developed senses (simply from using them - not blocking them with doing things or thinking).
The human brain was not meant to function the way that it does for "normal" people today. So people who are able to access the true, high perception and astute senses that humans were born with for survival, this man-made world is just too much for us.
We quickly learn that most people do not see, feel, and experience the world like we do, so we feel that there is something wrong with us. We become shy or introverted, or have "social anxiety" or panic attacks, or we get depressed and suicidal, or we get paranoid and have "delusions" about the world, or we shut the world out ("autism") or... These are not illnesses; they are symptoms of seeing ourselves as "different" in a world that is not right. Our realizations about our "gifts" and differences make us feel out-of-sorts and so we are labeled as such.
These feelings about ourselves are carried through the genes to our children, which is why new "mental illnesses" [and what I call "sensitive illnesses": food sensitivities/allergies, fibromyalgia (which possibly is related to the old unofficial label "hypochondria," after enough people experienced it), chronic fatigue syndrome, multiple sclerosis, etc. - although, diet, health, and lifestyle factor in and play a part in recovery] have been just "showing up" lately.
As the busyness and population of the world increases, so does the amount of high sensitivity "disorders." Our high sensitivity was always there, but the current state of this world is really bringing it out in more people, making it so difficult for people...difficult for everyone...because people are either further blocking out their senses with more thoughts, or the ones who are not able to do this are "breaking" under the pressures of our society's standards and way of living, powerless to their "awakening," which is essentially a realization of the chaos in the world (that the "blockers" are not "seeing" because they're trying so hard to keep up with everything) and tapping into our natural high sensory perception.
Many who "break" under the pressures of this world are medicated or hospitalized (some against their will) because they are not able to do what is required of them to survive in this society, where money, power, success, prestige, etc. are the goals.