Hello,
I understand that it is devastating to hear that your child has autism, in plus of his deafness.
Forgive my dumb questions, but have you been to the audiologist first to see if his HA are working as it should ?
What do the ENT doc say ?
If your child has another issue, it may not be autism. I may explain better myself.
My parents though I may suffer from Asperger syndrome because of my difficulties in social interactions (like parties, family dinners etc....). But it turned out it was ADHD, not Asperger.
ASD (Autism Spectrum Disorders) have been completely ruled out, and it have been proved that to me, my social difficulties are due to attention deficit. It's only my experience, so it worths as it worths.
Some aspects of difficulties in social interactions who looks like autism may be also ADHD, or something else.
Be cautious as I'm not a qualified professional, and I'm not able to make any diagnosis.
But I just want to say that you should ask to another specialist, better if knowing the deafness issues (I'm in France but my psychiatrist doesn't know much about deafness issues, as as far as I know, I am her only case of patient with ADHD and deafness. ADHD in France... well, don't tell me more about it, it's only Middle Ages ! However, my psychiatrist does a great job despite not knowing well the deafness issues).
A psychiatrist, as any other physician, who doesn't know about an issue but wants to learn makes often a very valuable job.
So knowing the deafness issue for a psychiatrist is not compulsory, but his/her will to learn is compulsory !
But don't forget to trust your feelings, shop for another if you feel that this psychiatrist is a wacko one, or if you feel he assume to know everything etc....