Interesting article originally posted on speedendurance.com i wonder if any of this works. I once made the mistake of having fish soup for lunch and then did 6x200s on 5-6 min rests and threw up in the last 10m of the last rep.
http://pinoyathletics.com/2012/10/22/how-to-avoid-vomiting-or-throwing-up-after-400-meters/