I too have a l ong history of nausea and vomiting after a race lasting for 3 to 4 hours. I thought I had solved it by using For Goodness Shakes recovery drink but the last time I did a half marathon, I threw it up in the car on the way home! Iknow I sweat profusely so am careful about hydration and use Blok Shots for nutrition during longer runs, but have not been doing this for some time, relying instead on jelly babies. Before a long run I only have a glass of smoothie and oats as I often run early and can't get up enough in advance to eat more. - maybe this is not enough?
It is rare for this to happen after traininhg runs but it has happened when I have pushed myself. A few weeks ago I even experienced this after a lovely, stress free 11 mile road and cross country run with friends. I was aware that I felt unusualy drained after 6 miles but pressed on.
Am due to run in the Brighton Hlalf on Feb 17th and am viewing it with trepidation and considering not running because of this problem. Any thoughts?