Littlepaw,
Thanks for your reply and your advice. And yes, I should've of course clarified my work-up. It sure was an MRI and CT scan, plus a nerve conduction study. No tumours, all fine in the brain and spine. Some compression in the lower back, which I've had for years.
So it's still sort of a mystery how the symptoms appeared over night. And I'm not sure if the patchy, episodical progression in symptoms are consistent with np, nor if it's consistent with "just" tactile numbness. Seems more like, to a layman like me, neuroborrelios.