My thoughts based on little or no confirmation (but 50+ years of them hitting me)
Hypo is partly where the brain is starved of glucose (only nutrient it uses from the red blood cells) and brain function is impaired
Depending on which part of the brain is affected first can alter the hypo symptoms - generally these follow the same patterns, but I have had extremes where I felt fine, no confusion, talking to others but stood up and 'failed to be able to walk' etc.
Generally I start to get confused, can sweat, shake run out of energy etc etc - but it just depends on the day sometimes
Happy for others to tell me this is tripe - just my way of thinking about whats been happening.
As
@Tony337 says - Libre alarms were life changing, had those vibrating my watch for 5+ years and its saved me loads of times