It might be seizure, there is a condition called absent seizure, usually occurs in children (but can occur at any age), but it typically doesn't have muscle jerking (since your hands are out of control during these episodes) check if you have aura kind of things just before the episodes. Using phones, computer in dark rooms can be a trigger as well. If it persists you should visit a hospital. But if it is a temporary thing it might be anemia or simple dizziness. Drinking water can be a simple solution.