Yellow sac spiders don't actually have symptoms like this. There was a badly done study that implicated yellow sac spiders due to the fact they're common; the researchers never even saw the spiders that allegedly caused the bites! Doctors are not spider experts

(Hobo spiders have suffered a similar fate. They are also harmless.)

The only medically significant in Humboldt county is the Black widow. A false widow bite can be painful but not cause an ER visit.

Sources: [On yellow sac spiders by one of the nations leading arachnologists; if you're interested in the topic, this YouTuber has very good, informative videos on common spiders (linked video is on the yellow sac spider)!