Hmmmm, well, I actually got appendicitis while traveling overseas and had it burst right after I got back. So you are in luck, I know both gall bladder and appendicitis pain, personally. I remember the appendicitis pain as being pretty constant and getting worse over time as the infection worsens. It is a lower pain on your right side, closer to the top of your hip whereas the gall bladder pain would be near your lowest rib.
Either pain should be checked out. And both causes have easy fixes with laparoscopic surgery, when caught early. You would have a quick recovery of maybe a week or 10 days and go back to your life as nothing had happened except with one less health threat hanging over your head. The sooner it’s dealt with, the faster it’s behind you.