Might be. Head turning left and right whilst conversing is a notable trigger for MAV particularly turning against a stiff neck. If you are turning it comfortably because neck feels better I thought it shouldn’t provoke dizziness unless you are really doing it alot, like 30-40 times maybe without breaks but you never can really tell. I’d suspect you went back into the work environment with a system that was already oversensitive because it hasn’t settled from the last bout and it was the proverbial red rag to the bull again. I found this years ago doing VRT with unstable MAV (although I didn’t know that at the time). I was already really quite violently dizzy and every time I exposed myself to a known trigger (ie, going into the supermarket) it would ramp up x10 and that would last for 3-4 days each and every time. The only thing it proved to me was that MAV when pushed too far can and will quite easily and quite literally knock you off your legs and unable to stand and put you in bed for days/weeks on end. The dizziness is a sign that yr balance system is struggling and you need to take better care of yourself. The vestibular system needs time to recover.