If your two weeks away.you could be.ovulating. i always ovulate exactly two weeks before my periods. it actually took us 5months of trying this time to get pregnant and last time one month. good luck :-)
The symptoms could be due to other things too. It's really hard to say. Best to get it checked out if it goes on too long though.
It could be many things. Dizziness and nausea can be pregnancy symptoms.... But it can also be an electrolyte imbalance, a cardiac problem, a premenstrual symptom, a hangover, etc... There is no way to tell until you take a test. Plus if you are still two weeks away from your period then you probably wouldn't have symptoms yet anyway, too early.