So sorry for your issues, I have similar parasites, & issues, but not in the head, yet?
Try a good coconut oil, Nutiva is the best, but Walmart has a good one by Natures Made I believe, in a small bottle, that I'm presently using. I read it crosses the blood/brain barrier but won't harm you, it will help with everything else too. Also, some coconut oil on the Butt, really cuts the activity of the pinworms! I use it internally, & externally.