Read the following context and choose the best option to answer the question.
Context: It is after midnight here now , which makes it Monday , which makes it two full weeks since I have felt any significant pain ( as in pain over 3/10 ) in my head . After three years of facing off with 8/10 EVERY NIGHT , I still can not quite believe it . It 's going to take time to adjust .
Question: Why did my head stop hurting ?
Options: 
A. I hit my head
B. I stopped sleeping
C. I took drugs that did n't work
D. I had successful treatment


D