I once had what I strongly believe was a parasite somewhere near the brain/left ear. It would create hearing problems just in that ear. I didn't target it specifically in that location, didn't take herbs that are known to cross brain blood barrier, but instead focused on getting rid of the HUGE parasite infestation I had in the liver/gut. Believe it or not, at some point, when my body got better and hundreds of parasites in the gut got removed, the parasite in my head/ear would just die (I literally could hear it dying, same kind that the ones I had in the gut, the "rope" parasite I believe). It would keep coming back, probably because of the eggs, but eventually at some point, it totally cleared up.
Remember, if you have a parasite in your head, you very likely have many more in the gut, because it is where the "pool" of pathogens is. So eat well, liver/colon cleanse, restore proper digestion and optimal gut flora, and the immune system will probably take care of this parasite on his own.