How high should my temp be before I go to the hospital?

I woke up at 2:30am drenched in sweat, like soaking. I changed my shirt and slept in a different bed. When I woke up in the morning, my temperature was 100.3 and now it's 101.8 & I've been taking fever reducers. I've been shivering, dizzy, everytime I stand up, I feel like ping out, and my shirt against my skin has been bothering the crap out of me <--yea, I know that sounds weird... Anyways how high should it my temp get before I need to go to the hospital? Oh, & I've already had my flu shot.