My daughter has Down syndrome with a severe cognitive delay, speech delay and severe ADHD combined type. We see a psychologist, Occupational therapist (for fine & gross motor skills & emotion regulation), speech therapist, physio therapist and a groups therapy.
I’m currently looking into Brain Train; Brain Train provides an integrated network of therapies for autism and other neurodevelopmental differences. Using a strengths-based, family-centred approach we can deliver very individualised and goal focused therapies and supports by a multi-disciplinary team and in the one location.
This month we will see the paediatrician, we may go down the road of medication as her ADHD impacts her ability to learn & live too much

From the comments you have in your post, my son was very similar at the same age to your child. We finally took him to a child psychologist when he was about 12. He was a middle aged man but seemed to relate really well to my son and big surprise to us was that our son actually listed to the psychologist. So it did help. This was a private DR. No the school was not very helpful. If you can find the right psychologist that is a good fit it might help you to understand more about it too. I know it helped me. Trust me it does get better as they get older. I don’t know about you but I found it very stressful not knowing how to help or if I was doing the right thing.

My older brother had ADD, he struggled the same with concentration and entertainment. My mother banned him from having Coca-Cola, milo, any cereals full of sugar, pretty much limited his sugary snacks and definitely saw improvement. My mum also had him start piano lessons to help occupy him and it took up a fair bit of his time practicing. He is now 27 and no longer has ADD so I do think some grow out of it.

Hiya,
A few years back there was a story on a current affair regarding your difficult situation!I was glued to the Tv as it showed the real life challenge and every day battle of parenting ADD children!I must say I was horrified at the behaviour of the children featured in the story I had no idea!These children were put under the care of a doctor in Caloundra (Sunshine Coast) and within 4-6 wks some under that time frame these children were totally transformed!His passion, care and methods had amazing positive results.Simply by changing there diets!Im only going by what I saw watching the story but WOW what a difference in these kids, truly wonderful to see.I hope this helps you.Kind Wishes to you and your children hang in there!

My 8 year old has a new diagnosis of ADHD, my husband doesn’t want to medicate so we are trying Effalex brain formula (imported from eBay) fish oil, it’s early days.
He has shown improvement at writing for a longer period of time as he does not like writing.
I’m sorry I’m not sure how to help an older child but maybe fish oils could help?

I would try googling some tips. You can never have too much info when looking for help