Im scared i have brain annurisim. headache in back of head all day asprine helped some eye pain nausea eye flashes. should i go to er?

See neuroophth: Aneurysm would be less likely than migraine or concussion depending on other circumstances i suggest seeing an ophthalmologist or neurologist. If available there are neuroophthalmologists who are sub specialists appropriate to your symptoms.

Migraine go to MD: Nausea and flashes are typical of a migraine headache. Symptoms include this as well as seeing shimmering lights. But with a history of an aneurysm you should get checked out especially if you have other signs of neurological loss such as numbness, difficulty speaking or swallowing, loss of function of a body part, or focal tingling or numbness.