Twice over the past ten years I have had episodes of loosing weight. On both occassions I lost 4 pants sizes without any effort. I was not at that time killing parasites, but my body stopped metablozing fats and became sensitive to glutens. During these episodes I could eat ice cream and cream cheese etc 3 times a day and still loose.
These problems were associated with Lyme disease, which is one reason why parasites become a problem for people.
Just keep an eye out for that. If you can eat fats and still loose,you may want to see a naturopath, I became mal nutritioned during both these episodes. I hope you find your way to health