Can hemolytic anemia cause low blood vol. thereby causing autonomic dysfunction? does body see hemolysis as trauma thereby triggering stress hormones?

Whoa: Hemolytic anemia won't affect blood volume but will affect oxygen carrying capacity. Further, if the cause is microangiopathy, lupus, malaria, or any of a variety of others, there may be a huge number of different problems. I'm glad you have an inquiring mind, but there's no need to invoke "stress hormones"; you'd do well to stop reading "pop" explanations if someone's actually seriously sick.