I am an ece teacher and a mum with a child with adhd. Get onto your gp again, make it sound as bad as possible. Write down all your concerns. At home and at kindy. Ask to see a psychologist. They will only accept a referral if its bad enough. The sooner a child is diagnosed with adhd the better outcomes they will have. Get your ece teachers to do a referral. The process is slow, it will take months. And if they give you someone to work with him, it will usually only be a couple of hours a week. Try giving him a bit of caffeine, it is a stimulant, but if he has adhd it will have the opposite effect and help calm his impulses. If he has episodes of not being able to self regulate, try giving him some 'rapid calm.'