Have you had your inner ear checked? The vestibular system is usually implicated when vertigo is experienced. Could be inflammation or some kind of abscess. Be careful if administrating antiparasitics especially when not under a physician's care with such symptoms. Though I know physicians seem to be less than helpful when it comes to treating parasites. A smart patient will use them for what they are willing to provide alongside their own self treatment. Vitals, bloodwork ie; liver enzymes,CBC, blood cell morphology etc.
Im.sorry you're having such trouble. Vertigo is very scary and uncomfortable to experience.
Have you had a spinal tap?