Anxiety over asbestos in child’s crafts

I have extreme OCD that focuses a lot on contamination and asbestos at the moment.

I have had the house checked multiple times, spoken with multiple surveyors and recently had a test in my son’s room last week on a textured ceiling despite two surveyors stating it did not need testing (came back negative).

However, more recently some play sand my son plays with has tested positive for 0.001% trace level or tremolite asbestos.

It has been all over my house. I have thrown out so many toys, chairs, tables and now hoovers. I have washed socks covered in the pink sand and then flung them in the dryer. He has been playing with the sand since February 2025 last year and I make a lot of craft and sensory trays for him.

As the sand gets everywhere, I am still finding tiny little specs of it everywhere as I’ve become hyper vigilant in noticing them. I have found the tiniest grain of pink sand in my 

I don’t care about myself so much but what are my son’s risks here? 
He has played with it, rolled, crushed it with tools, poured it all over his head!

My mental heath cannot take it anymore. I’m convinced he’s going to be diagnosed with terminal cancer. I have a cleaner who has likely hoovered small areas where it’s remained then can’t be seen like skirting boards. Do I have to tell Her?

Everywhere online tells me that the risk is low.  But if that’s the case why did entire schools shut down in Australia for professional cleaning and air testing???