I know you've probably covered it, but did you find out what was wrong?? Direct me to your post about it if you like...
Such a sweet horse...
Thanks! Best discussion of it is over in the horse thread.
If you read a little up and down from here
http://www.freerepublic.com/focus/f-chat/1124735/posts?page=3035#3035
You'll find out what was ~done~ about it, but we don't really know the cause for the colic.