So, this isn't really road cycling specific, but maybe some of you can help me out anyways.

Recently, as in the past month, I have started to feel lightheaded sometimes from standing up quickly after sitting down for too long. Happens mostly at work, and when it does I feel lightheaded, blurry vision, and dizzy. Sometimes to the point where I can't see and I feel like I'm about to faint. Happens from 1-3 seconds then everything is back to normal. I looked it up and got a lot of mixed results but mainly happens to teenagers, but I'm 21. It's been called Positional hypotension, Orthostatic hypotension, and postural hypertension, to name a few. I've been cycling a year now and have lost 60 lbs. I've never had this problems before but started having it now for some reason.

Anything to worry about?