I've had the hip and back pain and the gurgling (occasionally). I talked with my naturopath about these and basically it's your liver in the back and under the right rib cage. The other spot by your hip is where the parasites collect because it's where your body has the most "junk." It's the area around the illocical valve... you're appendix and other "junk collectors" are there. What you're feeling is pretty much par for the course, BUT, if it gets too bad and you're really hurting, back off on your protocol until you feel better. Then start back again in VERY tiny doses (much less than the suggested amount) and gradually work your way up. Once you start feeling the bad feelings coming on again, back off again.
You're killing things off, but if you're killing them off faster than your body can deal with it, it's becoming counter-productive.