Dizzy spells only when standing?

Audrey

My commute is about an hour and if I get a seat, I’m perfectly fine!

If I don’t and have to stand, I eventually break out sweating, (need to literally take off layers), have to hold onto something with both hands, can’t focus my eyes or hear very well.... what is that?! It hits me so bad I can’t hold my bag or phone, I need to put them down...

I once sat on the dirty floor of the nyc train bc I thought I would pass out.