I am not sure what you mean by brain swooshing, but I can try to explain my symtom, I feel a very strong pulse on the left side of my body, sometimes my head, sometimes my back, chest or legs, I am not sure what this is , have been to a neuro and am not ready to do further testing, what he told me is ifit feels like a pulse its vascular if it feels like vibrations is neuropathy, I am feeling fine besides this, have been treated for Lyme for apprpox 1 1/2 years, have been of meds but had some throid issues, my endo said low thyorid can also cause this vibrating feeling.
Most real LLMD's dont laugh when a patient comes in with a strange symtom as the best advise I was given when I first became sick is that WITH LYME EVERYTHING IS NORMAL, kept me going, are you being treated?