Adult Son to be referred for formal diagnosis

Hi everyone, I am new here.  I have an adult son who is very likely to have autism.  I do struggle as he has anger issues, some mild learning difficulties and epilepsy, although the epilepsy is medically controlled.  I need help with learning how to help and support him and try not to overload him with too much to prevent the outbursts.  I know we have a long way to go and I don't have a clue how long it will take to get a diagnosis but so long as I can read things on here and contribute it will hopefully help me to keep my sanity.