Child Aspirated On His Meconium At Birth And Now Having Gerd, Asthma, Adhd And Possible Autism. How To Treat It?

Hello! I have a son born in April 09 who is almost five years old. At birth he aspirated on his meconium. I was a wek overdue, very long labor, two hours in birth canal etc... my son inhaled the meconium into his lungs, caused collapse. NICU worked on him for a long time right in front of me. Putting tubes down him hanging him up like a chicken. It was very scary but they eventually got him cleared out and breathing. Long story short my son has always been a little difference. From extreme colic to gerd to chronic croup, asthma, and now adhd possible autism, I am VERY VERY convinced by lots of self education and many many different dr visits that is is related to the meconium, What can I do??