I Have Been Feeling Dizzy And Sometimes A Spinning Feeling

I have been feeling dizzy and sometimes a spinning feeling when I first sit up in bed from a nights sleep. If I sit for a minute the feeling stops and I can stand. I also will loose my balance if I stand up to fast and don't steady myself. I seem to have pressure at the bridge of my nose and behind my eyes. If I bend over or move my head to fast I feel off balance.