A 40-year-old woman presents for a second opinion for her chronic pain. She has had widespread pain consistent with fibromyalgia for several years. She describes her pain as achy in nature, constant, and worsening with strenuous activity. It is associated with poor sleep quality and “foggy” thinking but no clear deficits on cognitive testing. She has not responded to adequate trials of gabapentin, pregabalin, topiramate, amitriptyline, nortriptyline, duloxetine, and venlafaxine. Additionally, she has tried many complementary and integrative therapies to help manage her pain, and she has not responded to numerous herbal supplements and bioidentical hormones. She finds acupuncture helpful for short periods of time, but she cannot afford it in the long term. She is frustrated by the inability of her previous physicians to find a medication that relieves her pain. Her only medication is trazodone for sleep.
Physical examination is unremarkable except for widespread muscle tenderness.
Which of the following is the most appropriate treatment for this patient?