I'm disturbed by the push for people to do ADHD testing.. and in fact even the Economist recently wrote maybe we are looking at people wrong - "ADHD diagnosis is created by society norms"      

So why not look at fish oils and flax seeds in your diet? 

Or Human design 

http://geneticmatrix.com

specifically, look at your digestion and environmental factors... 

Visual Stress Opticians in Ireland 

https://www.elliottopticians.ie 

https://irlen.com/what-is-irlen-syndrome/