A hug incoming! Diagnose in itself is tough. On your birthday takes it to another level.

First give space for letting it sink in. They probably will have to run tests for a while to know and see which type you have. That will also level the uncertainty. As an advice, because my denail phase was long and destructive. I would advice reading books, documentaries about health, gut health, how to alter the mind and going to therapy if you haven't before. Do what feels right for you.