What Causes Dark Discharge,vaginal Pain And Frequent Urge To Urinate?

Hi m I anwer yr health queries right now ? Please type your query here...hey I am 26 years old women I never had this problem in my life I was at work I suddenly had a pain in my vagina I went to toilet n saw there was blood I thought I got periods that day itself I went to party had bear n vodka n vomitted. Next day when I went to pee I was literally shouting because I was having such an acute pain. It's been 3 days I am having pain and an uncontrollable urge to pee. The blood in first day of my period was v v dark like black. Please help me.