A fasting glucose level below 40 mg/dL (2.2 mmol/L) in women or below 50 mg/dL (2.8 mmol/L) in men that is accompanied by symptoms of hypoglycemia may mean you have an insulinoma, a tumor that produces abnormally high amounts of insulin.
Saguaro cactus are found in the Sonoran Desert of Arizona and Mexico. It can grow up to 70 feet, and live for over 150 years. My cactus is about 17 years old, and just over 14 inches tall. Talk about slow-growing!
Repot your cacti when they are well-established. As noted above, cacti grow fairly slowly. Depending on the type of cactus you have, it should take about 6 months to 1 year to grow to roughly the size of a large marble. At this point, it's a wise idea to repot the cactus in a different container.