I don't have a child with any attention disorders myself, but have worked with a lot through work. Dietary changes can make huge differences in children's behaviors. Making sure they get exercise to get out extra energy, in particular being in the outdoors. Working with an occupational therapist can be really helpful too, they help with things like sensory problems, teach children methods of coping with the things which set them off, and/or make them upset/jittery/nervous/misbehave.