my brother died today

he was 14, just started highschool. he has mild heart problems which were doing okay and we were told not to worry about it and that he'd be fine. today he went into cardiac arrest. the police told us he was dead an hour before they even came. an hour before my dad tried to wake him up. i still dont believe it, that he wont drive me to school when he gets a car, that we wont get piercings together, that he wont get married or have kids, that he wont finish his sculpture that me and my siblings were making together, that he wont send me anymore tiktoks, or make banana bread, that he wont show me weird food, that he wont bother me anymore, i fucking lost my older brother today and im never getting him back. nothing could have prepared me for this