It does sound like could have been bitten by something like that. I've had spider bites swell up like that before, not fun at all.
were you anywhere that there could have been spiders?
If you do seek help, you could go to the ER. they have to treat you. you'll get a nice hefty bill at a later time.
here is some more info on spider bites
http://firstaid.about.com/od/bitesstings/qt/07_spider_bites.htm
http://www.medicinenet.com/script/main/art.asp?articlekey=61266
http://www.umm.edu/non_trauma/spider.htm
if any of these sound like what you are going through, I'd make a trip to the doc or ER


