Hi Kat
Of course it's OK to worry, anyone would be anxious to be recalled. But it is a sign they are taking your eyes seriously, and if there is an issue they'll have caught it early.
Remember that when you were diagnosed back in 1984 there was probably not a lot that could be done if something went wrong with your eyes. I had that worry too when I was diagnosed. There was no laser then. Things are so different now. Lots of new treatments have been developed in those 30 years.
Hope the appointment goes well for you
czj