Wrote my chemistry exam and had a severe anxiety attack and failed it

As said above. I left things blank and completey blanked out. Couldn’t breathe eat think clearly. Fully FORHOT everything i studied. My average is rlly high throughout classes and this as the first time I experienced a horrible anxiety attack during a test. So this isn’t really common for me. Got a doctors note immediately exempting me from the exam and emailed it to the teacher and principal explaining the whole situation. What do you think about this ? I can’t have such a horrible experience happen again like this. Doctor also specifically said I’d be talking time to heal and recover and seek support. Basically saying I shoudnt write the exam at all on a recovery day. I snet the email yesterday. No response just yet. Still waiting there for one. What can I do guys? Thoughts opinions ? Advice ? Please help out !!