This has always happened to me. I often get light headed on standing up from sitting down. Sometimes I just get a bit fuzzy headed, sometimes I get really light headed and things start to go black, almost like I'm going to faint.
It happens everyday, multiple times a day. Never really thought much of it as I think it's always happened to me. But I was recently talking about it at work and no one else had this more than occasionally. Is it something I should be concerned about? My blood pressure is fine and it's checked regularly when I go for my pill.