I am doing a little research on gallbladder removal & appendicitis association. Except for a couple of articles not much so far. Both that I did find indicated a fairly high frequency of appendicitis within 18 months of gallbladder removal. Hopefully, they are wrong, I have about 6 months to go.
You don't say that you've had a post operative checkup since the gallbladder lap. You should get medical advice. Could be related to the surgery. Don't ignore.
Please call your doc and request to be seen and perhaps to have some liver and pancreatic enzyme level tests done. The location of the pain can be a bit 'tricky' but in some who have had gallbladder issues that resulted in irritation to the common bile duct, postcholecystectomy problems could be related to that irritation.
I'm not a doctor but I would have thought that the "misbehaviour" of the appendix (which is attached to the colon) is quite independent of the gall bladder.
If you do have appendicitis (especially acute appendicitis) then if this is untreated there is a chance that the appendix will rupture causing peritonitis which is dangerous and can be life threatening.
I suggest that you go quickly to your Emergency/accident department and ask them either to rule out appendicitis - or else confirm it and carry out the necessary operation.
Good luck
Morecambe