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>Always when I stand up I get very dizzy and it feels like I blacked out.
I know that this is quite normal, but it lasts for more than usual and it keeps getting worse.
Orthostatic Hypotension
>Is there a possibility that something is wrong with my "leg vein valves"?
You can have "vein valve" problems if you are pregnant or you are a huge fat bastard that sits 24/7 in a chair, or it could be a problem in the right ventricle. This leads to a leg edema; If you have big and blue legs you should go to the nearest hospital right now.
>And I once got very dizzy at work, I was standing straight for 3hours chopping some celary.
My legs and hands turned kinda purple(swollen as well) and I was about to pass-out. Is that normal?
It can be venous insufficiency (varicose veins) (probably) (congenital) or it can be a right ventricle hypertrophy (doubt)