Hypoglycemia is where your blood sugar is too low. And diabetes is when it's too high, correct?

Hypoglycemia is when your blood sugar is too low an Hyperglycimia is when your blood sugar is too high
Diabetes occurs when the body stops producing enough insulin or produces too much insulin to keep your blood sugar within normal ranges which is 80-120. A type 1 diabetic is born with diabetes an a type 2 diabetic developes diabetes during their life.It's a little more complicated than that. Many diabetics experience high and low blood sugar swings. Generally, we have problems regulating our blood sugar. Usually, if not properly taken care of, it will be high, but not always.
Yes, is right.
There are many reasons that can cause high blood sugar (hyperglycemia) - diabetes, stress, some medications (for example steroids).
Low blood sugar (hypoglycemia) usually happens if a diabetic person lowered sugar too much (for example took insulin and missed lunch or dinner)
I am a diabetic and I have both so the answer is yes, I think?! LOL It is a bit more complicated than that but basically that is almost right. Go to dlife.com and they can tell you all kinds of things about diabetes and hypoglycemia. They are great people there, and so are the people here.