Thank you for writing this. I am one of those children who wanted to disappear. Your son is lucky to have you.
My parents never found out. I only survived by wanting to know how the big book that is life continues, and by giving myself a purpose. I wasn’t diagnosed until I was 26. Spent a chunk of my life on Wellbutrin. Takes about a month to kick in, but once it does, works better than most. Meditation does, too. Purpose is the best though. I am almost fourty now, and still kicking. Mostly.
I wish you the best of luck. Hug him, if he likes it. That helps a lot.