Single mom special needs son

My son is 8 yrs old. He has DMDD, High Functioning Austism and PTSD. There is a Brain scan called QEEG that a Neuro psychiatric Doctor in Texas can perform. Out of pocket expense only. No insurance accepted. He has been in the highest level of pyschiatric care with NO improvements. He has been on over 10 antipsychotic meds with no lasting improvement. My goal is to receive confirmation and validation of his Mood Disorder so we can move forward with proper treatment. I had to resign from my work due to lack of finding  childcare with experience in mental health. He has had an excessive amount of visits to inpatient facilities, trial and error with psychotherapy etc. He has not been stable or regulated effectively.