First of all - Welcome!
Sorry to hear of this latest development. I developed OAS in adulthood; my kids developed it much earlier.
On a positive note, my environmental allergies have lessened somewhat in middle age, and as long as I take daily Claritin (which I take for chronic hives) I can eat a greater variety of fruits and vegetables. (Maybe something for you to look forward to?
) Seasons do make a difference - if my seasonal allergies are flaring, I react more to fresh fruits and vegetables. No problem if they are cooked.
If you know which pollens you are allergic to, it will help you figure out which foods you may be cross-reactive to.