I have had a terrible headache for 5 days now. i have been to the er in the past, it does not help. i cannot bare the pain anymore, what do i do

Go to the ER: First you a primary care doctor or neurologist that can treat you for these if they are happening regularly. But for now if it is the worse head ache of your life and you can't bare the pain anymore- go to the ER. There are dangerous causes of headache that should be checked out.

Headaches: The cause of headaches because there are several major types, e.g., vascular, sinus, muscular, tension, etc. Continue to see your conventional doctors but add a nutritionist or doctor of natural medicine who can lab test you for food sensitivities. A clinical psychologist can use biofeedback or clinical hypnosis as well. Lots of options. Peace and good health.

How long. ?: A few days of headache may be due to sinuses, tension, trauma etc. . A decongestant will clear that for you and feel much better. But if not working or lasting more than a few days you need to get evaluated. A primary MD is a better place than the ER. Thy can follow up with you. I may take multiple tests before they arrive at the cause. I'm the interim see posts on dealing with pain.