@JMAngel1 a diagnosis brings validation that you aren't losing your fucking mind. Not being diagnosed can impact your entire life.
My daughter's MH started spiraling on start of Secondary as did my lovely DBros decades before, he ended up as a school refuser, a recluse that barely left his bedroom, he had/has the potential to be really high achieving and was naturally talented in maths and computer science, he tried uni - became suicidal, went into a deep burn out, now works very part-time in the back office of a supermarket.
My DDad also shows lots of signs of autism, has been supported for the last 30 years by my mum because he can't cope with the work environment - does lots of voluntary work of his own though, spends the day litter picking the local beach and talking to the homeless.
Now my DDad and DBro have never been diagnosed and both feel it's too late now but you can trace autistic traits right back through the living memory of our family tree. Shutdowns rather than melt downs, sensory seeking, trouble maintaing relationships, general lonerness not fussed by friendships, repetitive behaviours.
So no, when DDs quirks started to become more troublesome you can be sure that I was on it, and had her assessed within 6 weeks of her MH starting to spiral to get accomodations in place swiftly. She now knows why she feels the way she does, schooling and my parenting has been adapted suitably that she is now thriving she is extremely gifted and has great hopes for her future but knows that she might need to work part-time to cope and is aware of adjustments that can be made to ensure she thrives into adulthood