I just searched my posting list and could not find a link but here is a response from Andreas when I asked him about some 'gunk' that I got out and about my LOUD bile release. :) Mine doesn't sound like it looked like yours but his answer (second part) may shed some light for you...
Unless the gurgling comes the ascending/transverse colon in that area, it may be the gallbladder having a better "flow." Bile is secreted for many foods, not just pure fats/oils, even when eating citrus fruit. Of, course, most of it is secreted when fats are ingested.
It is hard to tell from you description what the stringy stuff is. The body can accumlate all sorts of waste, including clusters of fibrous tissues, which it will discard when the organs become cleaner and more effcient. A job well done!
Hope this helps! And remember the saying around here...better out than in, whatever it was! :0)