Racing Heart and Dizziness?

Early I got into an argument and my heart began to race, but it never seemed to return to normal. It's been several hours and I can still feel my heart beating. Also, a little bit after the argument I suddenly got extremely dizzy. My head feels like I'm moving even when I'm laying or sitting perfectly still. I know I am adequately hydrated, and I check my bp (124/73, which is, by my knowledge, normal). My heart rate was 85, which is much higher than it usually is (69, normally). The faint feeling is getting worse, and though this isn't the first time this has happened recently, it is certainly the most extreme. Am I just tired or something? My mom is anemic, so could I possibly be too?