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Looking for some advice, I am training for the Manchester Marathon (first timer) and up until Sat my training was going really well, 2 weeks ago I did 15 miles and felt great at the end so I thought Sat's 17 would be ok. However, at mile 13 I stopped for a drink and some fuel and felt extremely dizzy to the point where I thought I would black out, I carried on for another 2 miles and felt ok when running but had to stop to cross a main road and as soon as I stopped I felt dizzy again and the last 2 miles had to walk/run.
I wasn't running too fast and can only assume I was dehydrated but not had an experience like this before. Does this sound like dehydration and is there anything I could do better to prevent it happening again. I am usally well hydrated before a run and I run with the lucozade still juice.
I have 19 miles to do this Sat so any advice would be welcome!