I know that feeling. Mine came on suddenly one day 18 months post menopause. Felt like I was doing everything at one remove. I found it very scary at first. It was accompanied by a whole set of meno symptoms so I eventually figured out it must all be related. Had it very often for a year, less so the following year, and now I get it occasionally. It still rattles me when it comes but now I know it does go, and happily it happens so much less than it used to. Hang in there xx