Our MN Head and Neck Pain Clinics recommend that you seek immediate medical attention if you’re experiencing the worst headache you’ve ever gone through, lose of vision, blacking out or losing consciousness, have excessive vomiting occurring at the same time, or if your headache lasts longer than 72 hours with less than 4 hours pain-free during that time. Any headache that gets worse after you have taken non-prescription pain medications signals a need to call your doctor. Or simple call if you are worried or have questions.