I am experiencing flickering lights in vision and sudden flash of lights. the following also describes me: headache. what should i do?

Possible migraine: Migraines can show up in many ways, sometimes as a throbbing headache located on one side of the head with nausea and intolerance of bright lights. Sometimes, however, a migraine can show up in other ways such as changes in vision WITHOUT a headache. This is called a migraine equivalent. You should talk with your doctor for proper evaluation and treatment.