That is exactly what happened to me. I was sitting at my desk and felt like I was going to pass out but didn't. For me this was the start of my roller coaster ride. I'll also feel this way when standing up and it is very scary. It's not dizziness, but I just feel like I'm going to collapse. I couldn't function for a few weeks (Had every symptom in the book!), but I'm on HRT and it has helped me a lot. I also take supplements regularly. Also, just knowing it's related to my hormones helps a lot with the anxiety/panic. Hang in there!

Spin808, I am so grateful you replied! This one has scared me! so glad I'm once again not the only one.

I'm towards the end of perimenopause so maybe I am getting on that roller coaster now and have been standing in line up till now,lol.

I have agoraphobia so am kind of tightly wound when it comes to panic situations, lol

I have had that happen to me. Even during my early years of menustration. I have yet to pass entirely out-thank God. But, now that I am in perimenopause the veritgo and that "sinking" sensation has intensified and a nurse told me that it can happen when the estrogen drops. I had walked out to my mailbox one day-which was on the main road and I was woozy on the way out there but on the way back wow!-I did not think I would make it back to the house without falling and that is scary. Trying to keep stress to a minimum matters a great deal and if something upsets you and you can do away with it then do so. I was in a bad rental situation-the landlord was brute who made my life hell-and I am a widow-but our former pastor offered me one of his rentals and things are better for me here. I am also a total introvert-by nature and choice and I get bad anxiety when people try to permeate my world-but you can "gently" put them in their place and help get that stress off of you.
I knew I was getting to the age when this would all take place, but like others it still hit me like a ton of bricks. But now that I know how much of my ups and downs are attributed to it it had made it a little easier to deal with.

Willsirishangel - two things stood out in your comments. "sinking sensation" and "it hit me like a ton of bricks" describe it so well! It's hard to plan things in advance, not knowing how I'll feel day to day. In the beginning when it was really bad, I'd have to shuttle my son to his activities but would just sit in the car and wait for him. Didn't have enough strength to walk from the parking lot to the gym to watch his games or enjoy his concerts. It's gradually gotten better, but I still get that "sinking sensation" once in a while, especially before my period. Knowing what is causing it really helps. At least I don't panic anymore and think I need to rush to the emergency room! I hope this all ends soon!

So that's what happens when your oestrogen levels drop thought it was my blood pressure playing up I get it all the time u just feel,like your going to pass out for no reason even sitting down get really light headed even when standing and walking around nearly fainted at the shops that was the last time I went out scared me that much I had to drive home started shaking haven't been to the shops for 2yrs too scared this will happen again feel unsafe.Sandy.