What Causes Strange Vibrating Sensations In The Body?

Yes. I m a healthy 72 year old woman. Just had something very strange happen. Got up from chair and within five steps I started getting lightheaded but continued walking out door. Within another five steps my head and body and legs were like vibrating, my legs really strongly, and felt a bit nauseous. Was afraid I was going to pass out but held on to railing and within probably 30 seconds it passed. I immediately thought low blood pressure, but the vibration was very strange and scary. Anything you can tell me about such vibration feelings throughout the body? It wasn t a tingling. Too rapid for that and not distinct like tingling is.