I've had 2 full days of diahrea with a low grade fever?

Keep up with fluids. If having lots of diarrhea, be sure to keep up with lots of fluid by mouth. See your doctor if painful, or bloody stools, or if high fever or chills (and if so, dont take Lomotil (diphenoxylat and atropine) or immodium).
Diarrhea. Diarrhea with a low grade fever could be secondary to viral, bacterial or parasitic infections. Patients with diarrhea have to stay hydrated, they need to drink a plenty of water. In case of headache, abdominal pain, persistent diarrhea with blood and fever you should see a doctor. .