Bad mental Health & Exam extenuating circumstance help- UOR

Here is Reading's Exceptional Circumstances policy
These are the two most relevant points to you on what they consider exceptional circumstances:
"c. Serious short-term illness or injury that is impacting a student’s ability to study
d. Worsening of an ongoing illness, or a worsening of a disability--including mental health
conditions-- beyond the fluctuation of the condition recognised by DAS and
accommodated within the agreed reasonable adjustments"
"44. If you believe that your performance has been adversely affected by exceptional
circumstances or if you have been prevented by exceptional circumstances from sitting one or
more examinations once the examination period has started
a. you have been adversely affected in one or more of your centrally organised examinations in
the semester one assessment period; or
b. you have been adversely affected in one or more of your centrally organised examinations in
the semester two assessment period; or
c. you have not been able to sit one or more of your centrally organised examinations in July; or
d. you have not been able to sit one or more of your examinations in the Reassessment Period
you must wait until your examination results have been published and then submit a Post Results
Exceptional Circumstances (PREC) form within four working days of the publication of your
results. Evidence should be gathered at the time of your circumstance and submitted, at the same time as the Post Results Exceptional Circumstances form; if it is not available at that point, you must submit it within eight working days of the publication of your results. Evidence presented after that date will be considered, but in such cases, we cannot guarantee that you will be able to sit examinations in the upcoming Reassessment period and you may need to suspend your studies to sit examinations in the following academic year. If you expect to need to submit a Post Results Exceptional Circumstances form, you are strongly advised to obtain evidence at the time of the circumstance rather than wait for the publication of results. If you are unable to provide evidence, you must clearly explain why you are unable to do so. Please refer to paragraph 12 above for further information on evidence."
I hope this helps

My mental health has been horrible for the past months, significantly impacting my ability to study or even to fulfil basic day-day activities. I’ve been a zombie, isolating in my room, sitting on my desk randomly crying and being overly restless. Lack of focus, struggling to sleep, everything. Just Tapped out. I finally took the steps to reach out to my uni’s counselling support 3 days ago & booked an appointment on Monday with them because it’s to the point of being unmanageable.
However, I have an exam on Tuesday and I would like to apply for an extenuating circumstances for it. I don’t have any current evidence of the mental challenges I’ve been going through though. I left leaving reaching out so late as it took me a lot of courage to finally do so.
Does anyone think the EC would likely be dismissed, and should I just not bother? Is anybody in Uni of Reading aware of how flexible they are in terms of evidence, all I can supply is evidence of the uni counselling appointment I booked for Monday as proof of taking the first steps of reaching out. And does anyone in UOR know how quickly they go through the EC forms, especially for exam ECs? My exams on Tuesday, currently it’s Saturday. I’ve left it all so late I feel pathetic and hopeless.