Does anyone know what could've caused this reaction?

No idea what causes that. How long did it last? Was it like lightheadedness or something else?
If I were you, I’d call a doctor.

You could have had a sudden blood pressure drop. It happens to me sometimes when I go from sitting to standing.

I don’t know if it will make you feel any better but strange things happen to me periodically. If they only happen once then I talk to my doctor about it (if I remember) the next time I visit. If it happens more than once over a period of a few days then I book a doctor’s appointment to get it checked out.

It might have been a momentary allergic reaction to something that passed by.

@tranquilsea Maybe. I do have low blood pressure. But usually when it drops quickly I get chills.

@28lorelei It only last a few seconds. First the feeling in the throat and then everything almost went black. No head ache or anything. Just a really fast dizzy spell. I quickly grabbed the counter because I was sure I was going to lose conciousness. I would say it happened in about 5 seconds. But to recover it took me about 20. It kind of felt like if the blood supply to my brain had stopped all of a sudden.

That happens to me due to low blood pressure when standing up quickly.

But, it also sounds like my reaction to low blood sugar, except I actually do pass out for a second. Then I feel fine when I come to.

@Supacase Do you get the throat thing? Thats the only part that doesn’t make sense to me.

The throat sensation is known as a vasovagal resonse (corresponding to the vagus nerve) and is not at all uncommon as an accompaniment to a sudden drop in blood pressure.

The drop in blood pressure can be caused by something as simple as standing up or obviously more complex heart problems.

If it continues to be a problem, you would be wise to consult a Doctor.

@Buttonstc Thanks.