Feels dizzy back of head. Example; sharp turn as passenger in car can cause feeling and can last hours. Worse lying down. Has minor Hemolytic anemia?

BPPV? Maybe benign paroxysmal postural vertigo. BPPV is very common, occuring sometimes in up to 5% of the population. It's most frequent in older persons but can occur at any age. Just as certain positions or movements can trigger it, positional procedures usually can reverse it quickly. Unrelated to anemia, hemolytic or other. Google BPPV for lots of websites; the Wikipedia article is pretty good.