I am curious if diabetics have real low blood sugars does it cause damage to organs as well?

Brain and hypo: The brain is dependent on glucose for fuel. If blood glucose gets low, you get neurologic symptoms. Initially confusion, "foggy", if untreated you can pass out, have seizure. Repeated episodes of severe hypoglycemia (i.e. Passing out) can cause brain damage, although there is probably no harm from repeated mild episodes, the kind that most diabetics have periodically.