ETA: I'm sorry - I was confusing the gall bladder with the appendix.
S.
Welcome to mamapedia!!
LOWER than your kidney's is NOT appendicitis. Your appendix is right below/behind your rib cage on the right hand side. Do you mean your belly button?? Running a fever? Since you didn't eat anything yesterday, the pain could be your bowels screaming for nutrients. What color is your urine? Have you had ANY bowel movements since your diarrhea episode?
With the pain that you are experiencing? You need to be seen by a doctor. I wouldn't wait. Personally. They will draw blood to check your kidney functions, AST, ALT (liver functions) and sugar levels. Hopefully, they will order a CAT Scan of your abdomen and check for appendicitis (which I feel your pain is too low for that), gall stones, kidney stones and a whole mess of other things.
My guess is diverticulitis or an ectopic pregnancy. If you don't have celiac disease....or a hernia...
Bottom line? Since you are in THAT much pain?? Get to your nearest Urgent Care or Emergency Room and get diagnosed by a doctor.
Good luck!!! I hope it's JUST the stomach flu and nothing serious!!