Help, please! O.O

I'm 4 days past due on my period, my nipples and breasts HURT (can't brush anything against them), feeling very nauseous around.. 8-10 each night. This has veen happening for about 2 weeks. I have tested and the test came back negative. :(

I've looked online and the breast pain could be from my period (although I have NEVER experienced breast pain before my period ever before), tell-tale of breast cancer (no history in my family), infection (not infected), rubbing against a shirt or a bad bra (which I don't really have a problem with).

I guess what I'm asking is.. Has anyone else experienced this? Any advice?