Wen walking u became off balance sudden and like dizzy spell feeling wen walking and head straight then looking down and up again head spins?

Positional vertigo: is one possibility. Having otoliths in one of the semicircular canals may trigger vertigo with a change in head position relative to gravity ( looking down the looking up ) Another possibility is a neck problem ( stimulation of a position sensor or less likely a compromise of blood flow) A third possibility is POTS ( autonomic failure) Read about these things and if the problem persists see a Dr.