Thanks for writing to H.C.M.
I have gone through your query regarding vertigo
for last 36 hours though you have some problem in your internal ear as you said about a stone in your internal ear, secondarily you have previous history of vertigo thus your current medication is not appears to be responsible for this.
I would like to tell you to consult any ENT doctor for evaluation of your vestibular system
to find out the correct fact and accordingly possible treatment.