Woke up dizzy and nearly fell over after getting out of bed, what could be wrong?

Benign vertigo: If your symptoms are positional, keep your head still or move in slow motion. Your condition is quite common and self-limiting after a few days. It may recurs, but cause is usually unknown. Some anti-nausea medications are very effective. Try to drink some ginger tea, which is a safe and is recommended in chinese folk medicine.