If you're pushing past 103 you should start to get worried, especially if aspirin doesn't take it down in about forty minutes.

I had a temp of 104 something a few months ago but aspirin made it go down a bit in under an hour so i didn't worry about it but everyone *else* did and if you're the sort of person who gets delirious and/or comatose with high fever, then - get thee to a doc. Or an ER. Fevers are nothing to trifle with.
Hope you're better soon!
*pet pet*