Une autre formulation

Hi Joanna,
A diabetic 'malaise' is more than feeling faint. Since there was loss of consciousness, the word 'collapse' is appropriate.
A 'syncopal episode' is unusually linked to hypotension, lack of blood flow to the brain, associated with 'fainting' in the more traditional sense. A diabetic episode is caused by low blood sugar.
Best wishes,

Victoria

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Note added at 21 minutes (2023-09-20 19:16:44 GMT)
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'Usually linked' not 'unusually linked' sorry.

Any of these would work, but I think 'syncope' would be overtranslation.

http://www.wordreference.com/fren/malaise

The first-quoted malaise could refer to a mild heart attack, whereas cardiac discomfort with loss of consciousness might be an appropriate equivalent for the next instance quoted.

French term (edited): pour malaise avec perte de connaissance

Pending Anton K's posting of his masterful exposition, I suggest this primitive, solitary - as opposed to a scattergun e.g. nausea, malaise, discomfort etc - translation. ('I'm surprised no one else has hit on queasiness').

Worried about the preposition of 'malaise with loss of consciousness' as the timing is unclear - preceding, contemporaneous or - from my own London Marathon experience - followed by such blank-out, I have deployed the idea of 'accompanied by a bout' to dodge the sequence of events.

Low CL / confidence level again to highlight the other, more confident answers.


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Note added at 3 hrs (2023-09-20 22:31:15 GMT)
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First instance > Il a fait un malaise : he came over queasy.....

Le diabète se caractérise par :
• une émission d'urine excessive (polyurie) …
• un appétit anormalement augmenté (polyphagie) …
• parfois une acidocétose diabétique avec dyspnée de Kussmaul.
D'autres symptômes peuvent apparaître, tels qu'une perte de poids, une fatigue et des troubles de la vision, ou encore une irritabilité.
:
Non traditionnellement associées à la maladie diabétique, ces nouvelles complications concernent notamment le foie (stéatose métabolique non alcoolique), le cerveau (dépression et trouble anxieux, risque de démence et troubles cognitifs) ainsi que d’autres ...
https://fr.wikipedia.org/wiki/Diabète_sucré#Diabète_de_type_...

Diabetic ketoacidosis … Excessive production of ketone bodies leads to signs and symptoms including nausea, vomiting, abdominal pain, the smell of acetone in the breath, deep breathing known as Kussmaul breathing, and in severe cases decreased level of consciousness.
Hypoglycaemia … An acute presentation can include mild symptoms such as sweating, trembling, and palpitations, to more serious effects including impaired cognition, confusion, seizures, coma, and rarely death.
https://en.wikipedia.org/wiki/Diabetes

Diabetic coma is a life-threatening but reversible form of coma found in people with diabetes mellitus.[2]
Three different types of diabetic coma are identified:[3]
1. Severe low blood sugar in a diabetic person
2. Diabetic ketoacidosis (usually type 1) advanced enough to result in unconsciousness from a combination of a severely increased blood sugar level, dehydration and shock, and exhaustion
3. Hyperosmolar nonketotic coma (usually type 2) in which an extremely high blood sugar level and dehydration alone are sufficient to cause unconsciousness.
In most medical contexts, the term diabetic coma refers to the diagnostical dilemma posed when a physician is confronted with an unconscious patient about whom nothing is known except that they have diabetes.
Types:
Severe hypoglycemia … Unconsciousness due to hypoglycemia can occur within 20 minutes to an hour after early symptoms and is not usually preceded by other illness or symptoms. …
Advanced diabetic ketoacidosis … If it progresses and worsens without treatment it can eventually cause unconsciousness, from a combination of a very high blood sugar level, dehydration and shock, and exhaustion. Coma only occurs at an advanced stage, usually after 36 hours or more of worsening vomiting and hyperventilation. …
Nonketotic hyperosmolar coma Nonketotic hyperosmolar coma usually develops more insidiously than diabetic ketoacidosis because the principal symptom is lethargy progressing to obtundation, rather than vomiting and an obvious illness. Extremely high blood sugar levels are accompanied by dehydration due to inadequate fluid intake. Coma occurs most often in patients who have type 2 or steroid diabetes and have an impaired ability to recognize thirst and drink.
https://en.wikipedia.org/wiki/Diabetic_coma

The most common cause of hypoglycemia is medications used to treat diabetes such as insulin, sulfonylureas, and biguanides.
:
Symptoms Headache, blurred vision, shakiness, dizziness, weakness, tiredness, sweating, clamminess, fast heart rate, pounding heartbeat, nervousness or anxiety, hunger, nausea, pins and needles sensation, difficulty talking, confusion, loss of consciousness, unusual behavior, lightheadedness, pale skin color, seizures, death.
https://en.wikipedia.org/wiki/Hypoglycemia

Given the symptomatology described above, we can phrase both symptoms depending on the severity:
1) confusion or cognitive troubles
2) clouded consciousness (until black-out).