I was able to get drastic reduction in Head/Sinus crawling by spraying Soverign Silver /Colloidial silver in my sinus, eyes, ears, nose and throat. The more often you spray the better. You can also drink some.
Take extended gargles with listerine cool mint flavor. Hold in throat for as long as you want and switch. This seems to kill the critters in the mouth and throat area. It also lessened the post nasal drip.
I am still working on eye floaters. Not quite sure how to get them out.
Also swabbing with ivermectin in ears and nose and holdin in throat helps.