You have done an EXCELLENT job of defining a parasite infection! Also,...the color of your stool indicates that your liver is dumping bile salts.
All I can tell you is what it was WHEN it happened to me.
Candida albicans, pork tapeworms, giardia, and liver/intestinal flukes. The liver concerns me,....and IT is telling you that it is sluggish, over worked, and may be fatty.
Do you drink?
If yes,...I'd cool it until the stool is not yellow, beige, or chalky!
Gallbladder/liver flush,...get those stones and sludge out,.....start on probiotics AND digestive enzymes,....buy papaya leaf extract,.....take detox bath soaks,...use epsom salt/baking soda/MSM. Yep,....these are some of the things I WOULD DO!