Is this head rush? I'll sit on the couch for like 5 minutes, I'll stand up and see bright colours?

Question

I also get a weird feeling in my head, and I can't always walk straight!

I mean I'm 14 should I be getting this?

Answer 1

It is caused by low blood pressure.  The same thing happens to me sometimes.  Just sit down again for a few seconds until it goes away and then get up slowly.  I find that taking my time when I get out of bed or get up out of a seat after sitting down for a long time prevents this.