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Often just understanding why you're suddenly feeling bad can lift you out of the mental dips, which often results in feeling physically better too.
Something that I suppose comes with experience.
I'll never take on something as insane as you but learning how to read your needs, feelings and thoughts while putting yourself under intense physical pressure is not something that comes natural to people. It requires making mistakes and learning from them.
It applies to cycling your first century, climbing your first big mountain, doing your first long swim etc etc etc
I planned my route that way so if I was having a really bad day then I could just stop at home and get to bed at a reasonable time. As it was I was feeling ok at that point, which makes it easier to carry on. If I was in a low point then it might have been more tempting to stop.
I had 6 hours to do about 22 miles, I think, which meant both goals were still achievable. New socks and shoved in a few forkfuls of vegetable stir fry (containing actual crunchy vegetables, not often found in running foods) and I was good to go.
I only realised earlier it must have been approaching 10pm as I was getting obsessed with stopping in Andover - around the time I'd normally be going to bed. Body and brain are both sending their normal "it's time to go to bed" messages, I just didn't realise that was why!
It's quite interesting trying to figure out why you feel a certain way* - sometimes you don't realise until a bit later on that it's the "3am dip" or you just needed some proper food because it's a couple of hours past lunch time. Often just understanding why you're suddenly feeling bad can lift you out of the mental dips, which often results in feeling physically better too.
*apart from the obvious "just run a long way" reason