Really emotional and stomach hasn't felt right... What could it be?

I have been pretty emotional within the past 5 or 6 days. Little things will make me cry in the drop of a hat! I am not a real emotional person and when I do cry I don't cry in front of people. Since this came on I have cried in front of several people. My stomach hasn't felt right either, but I just noticed that within the last 2 days. I get really nauseous at times during the day and night. I will feel OK and then all of a sudden I will get sick to my stomach. I don't know what is going on but I know I can't take this much longer. It is starting to drive me crazy. I just had my period on November 13th. Does anyone have any idea what could be causing this?
Really emotional and stomach hasn't felt right... What could it be?
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