My advice? Get to a doctor right away. I would've already been in there the hour the fever struck because I wouldn't believe it's a coincidence. I know waiting in the ER can be torture, especially if it's what they'd call "minor" (They usually let the people that are throwing up, bleeding large amounts of blood, are having a heart attack, etc go first) but it's for you own self so it's still important. Usually for spider bites what they'll give you is something to treat the pain and stuff and you'll get tons of nice antibiotics to take. I just hope you'll be alright, and if it was a potentially potent (that sounds weird..) species of spider, you'd probably be dead by now. (Just trying to make it better ^_^; not helping, huh?)