Arachnid

It's in there I know it is I saw it,
It made my skin crawl,
My mouth is dry,
Backing away not knowing what to do,
The family is out there is only the dog,
What should I do?
I'm terrified but I need the loo,
It's still in the bath I've seen it,
I look away it's no good it has to go,
The shower washes it down the plug hole,
Relief