S.H.
I know a woman who's a psychologist, & she was devastated that she missed the autistic dx in her own child. He was diagnosed at age 2, & it came as a surprise to her. She beat herself up for a long time over missing this (as she put it)....simply because she works with children every day.
Please find a way to be nice to yourself! It's been ?10 months since your son's dx....please find a way to embrace his special place in this world!
& as for the "why anyone's child?"....totally get it! I lost my daughter during her 2nd day of heart surgery, at age 19 days. 4 months later, my older son was diagnosed with a degenerative hip disease which will follow him thruout his entire life. It's been 18 + years now, & my only answer is to continue to have Faith. Peace to you. :)