Try making an appointment with your GP and asking for him / her to prescribe an anti-anxiety medication such as Propanolol. It can be taken as a fixed dose per day to eliminate the symptoms of anxiety when it's too severe to be dealt with any other way.
I would like to think your GP would prescribe you a course of it until the exam is over with as you describe more than a healthy level of nerves, in my opinion.
HTH.
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