What to do?

Yesterday I had to lift some really heavy stuff from work. Its over 50 pounds up over my head. My body just isnt used to that thats for sure. Well when i got home i spotted here and there and i thought it went away but this morning i woke up at about 2 with my right lower side just throbbing. It hurt so bad the rest of the night i was pretty much up and down with it. Then i guess i got my period which is a week earlier then it should of been. I've been hurting down there soo bad today. I stayed slouched over most of the day. What can i do to make all the pain go away?! and why is it doing this soo early? my periods have never ever been this bad before. I've cramped down there before but itd usually fade away and then come back its just staying constant nonstop. It hurts soo bad!! I know i ovulated on the 6th..i just dont know why my periods here so early!!!