I've also dealt with feeling ill (like throwing up sick) while running, and some of the causes turned out to be:
-Pushing myself too hard in terms of distance or speed. You might try repeating a week of C25K or running a little slower
-Eating too much fiber a few hours before running. I learned the hard way--by having to rush to various Starbucks bathrooms (TMI).--that eating things like apples, kale, beets, etc. is BAD NEWS (for me) before a hard run. Easily digestible snacks like bananas or yogurt serve me better.
-Either too much water or not enough water. There's a happy medium to be found there.
Just a few ideas--running is a process of trial and error, so hopefully you can experiment with different changes to get to the bottom of it!
3/16: Rock‘n Roll USA Half Marathon
5/18: Maryland Warrior Dash
6/1: Virginia Wine Country Half Marathon
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