Well, it sounds pretty severe and your doctor should see you if your in pain. Isn't that what doctors are for? I don't think that your headache (stress headache/migraine) sounds normal. How is your flow doing? Are you heavy or light in bleeding? I found this site resourceful
Women's Web - Symptoms associated with miscarriage
See a walk-in doctor or if the headache persists for more then 24 hours you should go to the hospital. It may be a chemical/hormonal imbalance, possibly high blood pressure
http://www.emedicinehealth.com/high_...article_em.htm, but I never heard of it causing such a distress headache as you are experiencing.
I am sorry for your loss and I send my warmest regards.
xox