Husband may be autistic.

Just before I post at any length, could someone please let me know that I am writing this in the right place? I’d love to have contact with someone about my husband who I think is undiagnosed autistic. He may be Aspergic, I have no real idea. I just know that he has some behaviour which is extremely challenging for me and also quite antisocial at times. 
He presents to the world as a highly capable businessman, but at home he is often more childlike. He has tantrums and tempers. He has unusual aversions and equally unusual fixations. 
We’ve been together 35 years. I’m exhausted and frayed and he has no idea. He’s also fraught at times but that passes and he’s forgotten it. 
Id love to be in contact with anyone who has any understanding of such a situation