Unknown problem does someone know what it could have been?

Anonymous
So a while ago, I participated in an event. Well my dad was I was too young but wanted to support my dad so I decided to follow him with my bike. I carried all the drinks,food, medication and clothes for my dad. We had to walk 100 km in I believe 24 hours. I didn't eat and barely drank 200 ml for the first 60 km. ( I know stupid but well yeah) 15 km before we got to the finish I started to feel weird. Like one moment I'm walking on the bridge and like a second later I'm walking on the road again, like I mist that part were I left the bridge. It got worse and worse, as at the end I couldn't even ride my bike since I couldn't feel my legs moving, I had tunnel vision and I had serious problems with remembering where I was. I couldn't comprehend any noises like I couldn't process it correctly. I would bump into objects since I couldn't control my body and my mind was basically working so slow that by the time I knew I had to stop I had already hit something. When my dad would walk just next to me I couldn't process it, and I literally started to panic calling out to him when basically he was walking a bit behind me, and from the moment I looked in front of me again and I didn't see him anymore I forgot it again and got scared all over. When the symptoms started I tried to eat some sugar cubes and such but I suppose it didn't work.

At the finish I ate a burger slept for a bit and I was completely better. As off today I still have no clue what that was. I tried to Google some of the symptoms but never really found what I experienced... So that's why I'm trying on here perhaps someone knows what that was.
Updates
+1 y
Dehydation ; shouldn't that also have headache and thirst as symptoms?
Unknown problem does someone know what it could have been?
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