I don't know that type of parasite, but it definitely sounds like you have a parasite
of some version. Feeling movement in the muscle tissues, or organs is a clue-in. Especially how you also see it bulge out, then disappear at times.
Most of the times, having tests sent to labs from our bowel movements won't always indicate anything regardless- and x-rays do not always reveal parasites
because of the density of the parasite, as well as how they are often camoflauged in organs and muscle tissues.
cleansing--like at least 2 months each year are good for everyone to do, so you may want to start on a Colon Cleanse
first- then lead right into one month of parasite
cleansing. Taking some oregano oil daily will get into areas of your bloodstream that will also come in contact with parasites
not in your digestive tract-- so you may want to also start taking 2-3 drops of oregano oil daily too, and see what kind of reaction you get in that area of your stomach.