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Hi, currently training for my fifth marathon. During training for the last one, I had terrible stomach cramps, retching and diarrhoea within five minutes or so of finishing a long run. I am fine during the run itself, it's afterwards. I was convinced last time that it was due to dehydration, as my long runs were a bit faster paced than previously and I was drinking water on the run rather than taking drink breaks. However, I've been very careful about taking on gels and water during long runs this time, but yet again as soon as I ramp up the miles, I have the same symptoms. It's making me think twice about continuing with my training. Anyone got any advice or experienced anything similar?