Natural remedy? Hard to say without knowing what you're dealing with exactly. Its smart to take the acv and probiotics to keep your belly healthy.
If it was me, I'd go for the ivermectin because it can kill a variety of things. But if you want natural, get stuff that keeps bugs away and is healing. oil of oregano is popular here. You can maybe take some in a drink and wash your hair with it? The premethrin (sp?) Shampoos that climber suggested are plant based. I also see a lot of people treating their skin with good results by soaking it in borax, water and peroxide.