The book All in My Head by Paula Kamen is excellent, she has daily headaches too:

All in My Head is a black comedy, a candid memoir and an informed journalistic report. It's about my often absurd struggles to try to cure one long 15-year migraine (now diagnosed as "chronic daily headache"), through odysseys through the extremes of both Western and alternative medicine.

The book stops to address different "big picture" issues involved, such as framing chronic pain as a "women's issue." This book is the first one written on my specific disorder, "chronic daily headache," a constant or near-constant headache, that affects about 4-5 percent of the population (and about 10 percent of women of childbearing age).

http://www.paulakamen.com/