I had this fuzzy head, I called it foggy head. Mine was due to a yeast overgrowth which sometimes occur along side the parasite proble. I have been following a candida diet- as close as possible and added olive leaf olive to help get the yeast under control. Also making sure your taking some type of rpobiotic to help replenish the good bacteria in your gut, especially if you are zapping. my fuzziness is getting better, it is amzing that I can think clearly now- headaches are what I get when I have a die off.
There is a website that has a questioniare that you can take to access if you might have a candida problem, the fogyy-fuzzy head is a major symptom. Here is the link if you would like to take it.