I take 2 1/2 baclofens every night before going to bed. (two 10mg pills, plus one that's broken in half) and it makes me wobbly and lightheaded most of the time (which is preferable to having my legs try to kick me in the butt with my heels)

I've never heard of baclofen being prescribed for vertigo.

Is it possible that he prescribed it for spasticity, and the spasticity was making your legs stiff and making you walk weird. (I know I walk weird when my legs are all stiff feeling) and since you upped the dosage, the spasticity has gotten better and that's what you were feeling?