Hi there - I do not know much about
appendicitis (thankfully...) but since no one else has jumped in, I will (bump your thread at least).
I always understood appendicitis to be pretty much an emergency get-it-treated-right-away-or-die
type of situation. So hopefully you've been doing some more looking to tell what's going on? Personally I'd try one of the online symptom checkers or a nurse line through insurance if you have something like that. You can do that even better than I can for you, since I don't have personal experience.
But please, PLEASE, make sure!