I totally sympathise OP. You're really not alone.
I start working myself up in the last week of August knowing that spider season is coming. Since then, I dread going to the toilet in the middle of the night and do it in the dark like other posters up thread. I scam timidly the coving and skirting boards. I darent pick items of clothes up that have sat on a chair overnight etc. I'm jumpy and anxious, just waiting for a giant house spider to be lurking there.
It didn't help that last year around this time, DH spotted (thankfully) a large house spider by our bed and grappled with it to finally put it outside. The very next night, one the same size came darting out from under the bed by my side (it was definitely a different one as I watched DH put the other one out the window). We didn't know where it went so couldn't even get it out. DH had long lost interest and fell asleep - I'm still paranoid where it went to this day!!
BUT, I joined the Facebook group mentioned by the above poster. It hasn't cured my arachnophobia but it does make you more (? compassionate) towards them...I'm now fine with small, even medium ones , it's just the biggies I am utterly petrified of.
Indorex flea spray gets recommended on here a lot. It does kill them though.
I try to : keep windows closed as much as is reasonably possible. Shake washing before bringing it in. Be extra studious with bleaching and disinfecting tile floors etc. hoovering more often.
We still have a lot of clutter (young kids, lack of storage) but they do say minimise clutter. Spiders love hiding between boxes etc.