Can someone help me please?

Elevated white cells and enlarged lymph nodes usually indicate an infection. You really haven't given me enough information to make a diagnosis, you said rapid temperature change do you have a fever, you usually do with an infection. You don't give a quadrant of your abdomen that hurts so that makes it more difficult to diagnose. Is it above or below your belly on? Is it on the left, right or in the middle of your abdomen? When you ask for help you need to be more specific so without more information all I can say is it sounds like an infection somewhere, sorry.