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Contact your academic tutor as a matter of urgency (or any member of Teaching staff e.g. module convenor or department head if you feel more comfortable talking to them if you don't like your academic tutor).
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Make an appointment with your GP regarding your anxiety ASAP. If you have evidence that you have seen a gp (even if you aren't diagnosed) it will show that you are trying to do something about it. It might even give you a reason for mitigating circumstances.
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Contact your uni's disability office if you have any sort of diagnosis you can get reasonable adjustments e.g. separate room, extensions. Whether these apply to extensions that have passed idk
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Do not book any holidays for summer. There is a chance you could possibly resit those assignments depending on your uni.
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Decide if uni is for you or not. Do you like your subject/course/city. Would you be happier at another uni if you reapplied?
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Evaluate your current studying/organisation process and improve it.