They might've actually had something like a nervous breakdown or a TIA.
PSA: Don't self-diagnose, esp. if you're not an MD. 99% of the time, you'll be wrong.
At first I start to feel a little bit "stupid", like my brain isn't functioning properly, and is working in slow motion. Talking is more difficult. Next I start to feel a bit weak/shaky/trembly. Next I start to feel anxiety/dread. Sometimes now I can get very aggressive (which isn't in my nature at all!). Then comes an incredible desire to eat sweet things - once you start eating, it can actually be difficult to stop! Depending on how bad things got, I might feel too confused to actually just go and eat something.
Now, all being well, I did eat something, and will start to feel a lot better within 10-15 minutes.
If I didn't eat something (because there wasn't anything available, or because the "stupid" feeling had given in to confusion, and I didn't know wtf was happening), everything ramps up - the anxiety becomes full on dread, the world seems to be caving in on me, and I literally feel like I'm going to die. The weakness feels like I need to lie down (a couple of times I have, but thankfully my partner was at home and found me). The "stupid" feeling gets much worse - my speech is slurred, and finding the right words to talk is very difficult - mostly what comes out it is "umm.. err.. what?.. uhh..".
> Then comes an incredible desire to eat sweet things - once you start eating, it can actually be difficult to stop!
This sucks a lot with diabetes. The survival mechanism kicks in and tells you "eat something, anything, everything", which can subsequently cause your blood sugar to skyrocket, which you then have to correct with more insulin...it can send you on a blood sugar roller coaster than can ruin your entire day. Diabetes sucks.
My dad was using low blood sugar as an excuse and insulin as an enabler to eat crap, and gained a lot of weight.
He eventually got an insulin pump and cut down on simple carbs.
For me, a CGM was the biggest game changer, by far. Second was cutting down to eating one (larger) meal per day.
If you're not diabetic and have low blood sugar from exertion, just stop what you're doing and drink some water and rest. Your body will handle it just fine. Carbs should be reserved for real emergencies.
In my particular situation, the best way to manage things has been to go keto - any more than around 5g of carbs causes me to have a hypo, presumably because my body over-compensates and releases too much insulin. I switched to keto a few years back, and my life has been so much easier since then - I went from having a hypo multiple times a day, to very rarely. It's been several months since my last one.
If I hypo (or in the more general case when a T1 takes too much insulin by mistake and hypos), the "healthier" option is to use glucose tablets or a glucogel tube (a measured dose of glycogen, often carried by T1s).
But when you're having a hypo, you don't always think clearly - it's fine if you catch it early enough, but otherwise it really is like you're under a magical compulsion to eat as much sugar as you can; I'm not sure there is another experience I can relate it to. And once you eat some carbs, it's 10-15 minutes before you even start to feel better - believe me, you can eat an obscene amount in that time!