Sudden vertigo after 3 years

[Pablo]

I believe that vertigo is one of the common symptoms of AN, however I went through FSR 3 years ago, follow up MRIs show the tumor has shrinked about 4mm from original size (original was 3 cm), and I've never had in my life any vertigo episode. THis came out of the blue 3 days ago and I was wondering if someone had a similar experience post treatment ( 2 years +) which might indicate it is related to the dying tumor. My last MRI was 5 months ago showing clear shrinkage. Also, if it is related, could that have something to do with tumor shrinkage?
THank you in advance.