Wen, I've experienced the same as you. The thing about having these critters in your brain is they feel much bigger than they are. So what feels like a roundworm could really be a colony of protozoa or spirochetes. My recent brain issue was calmed by the use of Artemisinin --> for Babesia.
In-between herbs? You're probably talking about Humaworm's protocol. He has a wonderful product but the dosing schedule is not realistic. This is by far the best anti-parasitic I've taken though.
Those of us battling long term parasites/tick borne diseases are fairly polluted with toxins: heavy metals, pesticides, chemicals etc.. There is a synergistic relationship happening. Do you have amalgams?
You have to work on many aspects: toxins, parasites, even emotional stuff. It's great if you have a Dr. seeing you through this, as it can be overwhelming.