What Causes Fatigue Along With Excessive Hunger And Nausea?

My name is Brittany, I have had this problem before but we ran test and nothing ever showed up out of the ordinary. However it is starting to get a little worse then what it was before. I am tired all the time regardless how much sleep I get a night, Im super stressed out and everything irritates me easily, I feel more hungry then usual and when I eat I still feel hungry and neaseas like, my brest are tender and are starting to itch I know I am due for my monthly visitor on thursday this week and Ive taken a pregnancy test last week and it was negative. COuld this be signs of my period about to start? Ive never felt this way before any of my periods normally I jsut cramp and my brest start to hurt here and there and thats usually when I know its coming but this time is different. ANy ideas of what it can be or how I can help this situation?