What Could Cause Sharp Cervix Pain, Dizziness, And Bloody Watery Discharge After An Unusually Long Period?

I m a 23 year old female Last week my period lasted longer than usual, (2 extra days) after that I started experiencing lower abdomen pain and it worsened to sharp cervix pain every time I stand up, it hits me every few seconds when I m standing and Im also experiencing heavy discharge that s watery and a bit bloody sometimes. Sometimes the pain becomes so severe when I m standing that I get dizzy