Old Drs called this brown-reddish stuff "miserere", if it is what I am thinking of. Intestinal content finding its way up, when it can't go the other way. At this point 7 + 11 days of impeded elimination, I believe you need to think of interrupting your fast with a little bit of honey and the electrolyte solution we talked about. Watermelon is also awesome for that.
I feel you may be in danger, if you do not break the fast the next few days.
Hopefully the next time you'll be prepared better.