Vertigo on Arimidex or other AIs? Who's suddenly 'got it'?

I have been on Letrozole for 3 and a half years & had an attack of positional vertigo a few months ago at 4.00am. My husband performed the Epley manoeuvre which made me violently sick but I improved enough to see a doctor later that day & she repeated it. I have been fine since. I had positional vertigo for the first time over 10 years ago so not sure if this recent one is related to that or Letrozole. I work for an ENT surgeon & she said to call her if it happens again.