Used to think similarly; however, I've learned that I get things done a lot quicker when I do listen to that pain. When I do not, my body/mind are multitasking- trying to both do the thing and ignore the pain. 

Recommitting - day 7. I am mindful about who I am, and I will continue to change my life. I do not want to waste a minute- every second I get to inhabit this body is a blessing, and opportunity granted by god/universe to lessen the suffering of other living beings. Po

Thank you for this, i guess i will add more water in my day

Totaly it can be a thing. I eat big meals 1kg-1,3kg of food once twice per day

From my experience sometimes drinking water reduces fatigue because it slow digestion temporarily. could it be that you ate a big meal and when you drank water it just slowed your digestion?( I'm not excluding the possibility that you were simply dehydrated, but just raising this digestion effect possibility to your awareness 🙂 )