So the problem may occur although extremely rare when drinking too much water all at once.

Although I was far from that, there was a time when I'd drink 1 liter in 5 minutes to get all my water consumption during the day
cos I'd be out driving 3 hours later (after 3 hours time worth to urinate) on the hwy where it would be inconvenient for me to use the restroom

from my research, i've also found that a remedy in the case of headaches coming on is to eat something salty

Sodium is a tie in to alleviating this problem

In fact, electrolyte drinks like gatorade may be important to add to a heavy water regimen

as always, hope my niceguyresearch helps not only me, but others similarly situated....

https://www.healthline.com/health/dr...-overhydration