Missed period, no signs of period coming, negative tests, multiple symptoms of pregnancy? Help?

Go see your GYN. And get checked for hormonal imbalance, ovarian cyst, etc. http://www.medicinenet.com/script/main/mobileart.asp?articlekey=106793.
Give it more time. Give it at least two weeks and try taking another pregnancy test. If it is still negative then i recommend seeing a doctor so that they can make a proper diagnosis and help you from there :].