So sorry you are going through this Clover.

Are you in WA still? I am not sure what services are in place there but if you were in NSW I would recommend Royal Far West both the outreach service depending on your location and the Royal Far West School. Basically in short it attempts to provide assessment of your child/ren over a period of time with a number of specialists to see what issues are present, what they are and devise a management plan. There is obviously no quick fix but I have only heard good outcomes at improving a child's life at school and at home and helping prevent a further deterioration. Your GP sounds like his not interested in helping you.