flu or pregnancy??

A nurse diagnosed me with a flu and sent me home. I don't even have sore throat, coughing etc.. 
I've been having dizziness, cramps here and there, nausea -threw up, late period, body temperature changing off and on, food craving and bloat. 
Still no period sign but I'm sure this is not the flu, YET 4 pee tests came negative. I feel crazy but I know my body.