GSE will kill off yeast quickly. Eight drops of it sounds like a lot. 2-3 drops two or more times per day should do it. If you mix it into something strongly flavored like Welch's grape juice, you probably won't taste it much. Diarrhea results when you have a yeast die off...not to be too too gross but a cottage cheese like result is not uncommon along with a very sour odor.
Other things to consider to fight yeast include (along with the things mentioned by spookyhurst) biotin, monolaurin, a probiotic that is a yeast killer called THREELAC, and also aloe vera juice. I hear there is a brand of aloe vera called George's that tastes much like water. Coincidentally, I just ordered some myself today from amazon.com. The added benefit of aloe vera is that it also has anti-inflammatory properties that can be helpful to Crohnies in addition to helping to rid the body of yeast.