Yes appendix pain can come and go for a year or more so if you've been having pain especially abdominal pain that has been coming and going for a year then you should get checked out.
I experienced abdominal pain myself for a around 6 months and I decided to have it checked out and sure enough it was my appendix that was going bad and my appendix was about to burst soon.
I had surgery done to remove the appendix after that I never experienced that pain again.
So yes I'd highly advise you to get the pain checked out if you're having abdominal pain that is coming and going.