I am having period symptoms without a period, actually my period doesn't come for another two weeks. Yet I am having these symptoms as in abdominal pain, nausa, dizziness, and mood swings. I am worried that something might be wrong with me.

Also I am on birth control, but I did miss a few days last month.

Since you missed a few days of taking the pill, pregnancy may be an increased possibility. It's also possible that it was enough to throw off your cycle off and your period will be off its usual schedule.