Severe migraine for several days, no med, no remedy works, should I take Excedrin (acetaminophen, aspirin), any side effects, age 28, 140 lbs, female?

That is safe. It may help you to take 1 excedrin 3 times per day for 3-4 days. For long-lasting migraine headaches, sometimes other remedies are helpful, such as the medicines amitriptyline or propranolol. Are you certain it is a migraine?