Main symptom is a bad headache and nausea. been feeling weak all day. prolonged periods much heavier than normal. not sure if i should go to doctor?

Bad means see doctor: Most people get a headache at some time, such as from colds, infections, lack of sleep, too much driving, long hours on a computer, stress at work, etc... Over-the-counter options include Tylenol, Motrin, Advil, Aleve, Excedrin, etc... A bad headache (as in this case), recurrent headache, weird headache, or one that won't go away should be examined by a doctor... especially if feeling very weak.