ADHD & Autism..

I need some help and advice please.. my son whos 5 has been reffered for ADHD and AUTISM. He has recently had his ADHD assesment and its come back that he has ADHD.. im not too sure the difference between the two, and what problems of my sons would be classed as ADHD or AUTISM.. could anyone help? What im really asking is if he may only have signs of ADHD and not Autism, or if someone knows that his symptoms come across in both categories.. *he wont wear clothes or school uniform. Will only wear one pair of trousers and t shirt everyday (everythings bunpy)* *has meldowns and cant get himself out of it* *constantly hurting other siblings* *wont have a hot bath, has to be stone cold* *still has a baby bottle that he wont let go of* *wont wear boxers* *has to have his thibgs his way, cannot be touched* *doesnt sit till or stop talking* *wont eat ANYTHING touching! Will only eat bacon or sausages!* *hates school, have a 20 min disagreement with him just to get into reception* are these all signs of ADHD, and should i pull out of his autism assesment? Or are any of these traits of autism? Anything he shows at home is also shown at school..