I agree with Anna, I would call my Doctor! A bad headache for three days is torture. Perhaps your Doctor can help you out? The pain will start wearing you down and I would hate to see that happen to you. Especially with 10 days sober. I recall having headaches myself, but not to the extent that I needed to see a Doctor.
I hope you feel better soon.
Best Wishes To You and Congratulations on 10 days!!