Ornithine or even better Ornithine Alpha KetoGlutarate can help with the high ammonia levels in CFS. Drinking liquid protein drinks following oil supplementation such as Omega 3 is also helpful because liquid protein is quicker to breakdown which is helpful.
Either that or actually blend/liquidize your protein meals to speed up protein breakdown is helpful. Save your chewing for fruit and veg but consume those separately from your protein.
However you are on the wrong track with the belief in a parasite being responsible because that is not the cause of Chronic-Fatigue-Syndrome in any Chronic-Fatigue-Syndrome suffer. Read between the lines and you might work it out. The problem is your short circuited digestion, ie stomach acid.