I just had my period and it only lasted two days, my period is usually 4 days and I was barely bleeding! I have also had the feeling of being sick and not throwing up along with the light headed and dizzyness

Are you sexually active ? While this of course is a sign of a 100 things, without a doctors exam you may not know from harmone imbalance, to the flu. It is of course a more common sign of pregnancy also.