I had my period almost 3 weeks ago and been cramping sometimes discharge ctaving food tired sometimes today feeling sick and sleepy help?

Multiple reasons why: 1. Depending on your age you may be experiencing early symptoms of "endometriosis" a condition that is related to worsening period cramps and menstrual irregularity. If this the only time you had a problem like you describe, you may have experienced a ruptured ovarian cyst. Other causes may include irritable bowel, urinary tract infection or other issues. Fatigue etc is other unrelated issues.