Hands and/or mouth go numb
Whenever I stand up fast, I get terrible headrushes, everything goes black for a few seconds- and Both my hands go completely numb for around 15 seconds. Occasionally my mouth will go numb too, the pins & needles feeling. Also, I get a squeeling noise in my head, while everything is black- but I don't lose consciousness. It is a high pitched sound, like the ringing in your ears after a loud concert.
I have blacked out a few times while this has happened.
Does anyone know what this is? or is it just a bad headrush? Maybe low blood sugar or something??