looking into a high quality fmri to go along with whatever diagnosis. could be worth paying for. a lot can be told from looking at resting-state functional connectivity. can be much more efficient route than multiple psychiatrists throwing darts a bit blindfolded. not sure on prices here.
also, handedness. any lefties you meet. not all, but many...are wired a bit different. can be a blessing really, but helps if parents understand it. ~98% of right-handed people process language predominantly in left-hemisphere. 70% of lefties do too. the remaining 30% are the odd ones. learning some about this helped me understand things about myself.