Sudden onset is very concerning OP. In the US most pharmacies have a FREE blood pressure check station. If the top number is over 160 and/or the bottom number is over 110 go to an urgent care, if the top number is over 180 go to an ER. If your blood pressure is normal make a primary care appointment or audiologist appointment because sudden onset still highly suggests that it's a secondary symptom that may very well go away when the underlying cause is treated.

TLDR; good news very possibly not actually permanent, bad news, you actually really need to check that you're not sick.