Hello, gab.xx, Severe lower abdominal pain,nausea, chills and possible fever symptoms are suggestive of some infective process in the abdomen. If you are also experiencing urgency and some diarrhea , we will have to consider the diagnosis of Acute Diverticulitis. An infected Pocket or pouch called diverticulum that arises from the wall of the colon. More common on the left side and lower part of the colon called the sigmoid colon. The condition is more common after the age of 40-45 , but can happen in younger individuals with family history of same. Also, you have to rule out other bacterial infections and you may need to have your stool for culture. If you have been on any antibiotics recently we also have to think of C.Difficile infection. That can be ruled out by testing the stool for Toxin A & B. It can be treated by medications. Viral infection , either Roto virus or Noro virus can cause GI symptoms. Keep the hydration good by drinking electrolyte containing drinks and stay on a bland diet. But you do need tests including blood count(Complete), stool studies and possibly a CT-Scan of the abdomen and pelvis to rule out Diverticulitis. If this is confirmed , you need intravenous antibiotics, fluids, and close observation in a hospital setting. I wish you well.