Pain In Abdominal Area, Low Grade Fever, Feeling Cold, Fatigue. What Could Be This?

Woke up yesterday morning with pain in abdominal area from underneath my breast to my pelvic floor. Very hard to get up and down from sitting and lying position. By late afternoon I was freezing and had low grade fever. Slept from 6pm til 7 am this morning. Abdominal pain is now from about belly button to pelvic floor. Have had bowel movements and my kidneys are working. Not as hard to get up today but still can't get around very well. Fatigued, no fever but still I'm cold. Have high pain threshold but this is very painful. No gas but feels like I'm full of it.