I had a touch of that veering to the left a couple of years ago. the doc sent me to "Strange ailments dept" of the hospital but they didn't have a clue, it was scary as I'd be walking along the main bypass with Mr N and would veer off into the road, so always had to grab his arm, couldn't stop myself. My sister thought it was hilarious that year when I was in Eastbourne, even in the shops I'd go off to the left, always the left. I could feel myself doing it, but couldn't stop and I'd have to shout to her, I'm wobbling" and she'd come back and straighten m out. I put it down to madness!!!! Not sure but I think my head felt fuzzy!