Why do i get random dizzy spells which are sometimes followed by extreme fatigue?

Migraine vs Vertigo: If the spells are true vertigo (a spinning sensation, not just "floating") that lasts about a minute associated with nausea and triggered by head movement, you may have a condition called bppv. This can be treated with physical therapy. Another possibility, especially given the fatigue, is a vestibular migraine. A neurologist would be able to investigate and guide treatment.