Do diabetics get more migraines?

They can. Migraine is a reaction to a stressor state. For a patient prone to blood sugar problems, either too high or too low blood sugar can trigger a migraine reaction. However, migraine is so common that they may get migraines even when their sugars are fine. Some can predict their sugar level by the appearance of early migraine warning.
Not usually. Nothing in the literature indicates this group more suceptible.