I was supposed to have my period about 26 days ago. I still haven't had it, and I have taken 3 HPT, they all came out negative. I've been feeling dizzy and REALLY REALLY tired all the time. I have body itches and headaches andi feel sick at night and in the mornings. I'm also urinating more than usual, I keep waking up early having to pee really bad. I had a small fever too... what could this be or mean??