CD 42 and freaking out

I KNOW I'm not pregnant for a fact (engaged in no sex whatsoever), but I don't know why I'm so late. Also I'm having sore breasts and nausea and just complete discomfort in my abdominal area (including bloating). On top of that I'm more dizzy than usual and getting headaches more often. I also always get a weak legs feeling when I have my period, and I kind of have that feeling but no period itself. Do you think these symptoms are a result of being so late? Plus, it's always been irregular but this is stretching it too far I feel. Any opinions?