Partner on a downward spiral

A couple weeks ago at out NT scan we were told we had a 1:24.m chance of having a baby with downs

So we did all the genetic testing to be sure at that came back complete low risk 1:10000

But my partner is really shook from this experience, he has gone into downward spiral of worrying about everything !!

I’m trying so hard to be understanding & loving but he’s pissing me off

He’s actually acting as though it’s dooms day I haven’t seen him smile in weeks.

He’s just finding new things to fixate on & worry about.

The doctor told us we don’t have anything I really worry about now & to enjoy the pregnancy but he just can’t seem to get over it.

Anyone else had experience like this, I feel so happy and confident but he’s dampening my pregnancy experience

I don’t know what to do ..