Temp 102 , sore throat, aches, chills and fatigue. started yesterday with sore throat and cough. i feel like it's the flu but test was neg. what is it?

A false neg test!: Sometimes, the test kit is inaccurate, despite a "duck looking, squawking and smelling like a duck". Testing for the flu using "rapid" methods, can be notoriously inaccurate- 40% or more samples from pts that actually have flu, can have "negative" test results. Otherwise, depending on your situation, other viral infections such as HIV, are possible.