results day stress is eating me alive

i can’t do anything in this summer because i’m overwhelmed with anxiety, i’ve had many panic attacks and nightmares about results day and it feels like no one else my age is as overwhelmingly worried as i am. i went on holiday to mallorca and the whole time i could barely enjoy it or relax because my mind was spiralling what if someone has just marked my failed paper. really this is me asking does anyone have some tips on how to calm myself down a bit because this is taking over my life and i need a rest