The primary purpose of this study is to preliminarily estimate the efficacy of
psilocybin-facilitated treatment for fibromyalgia. Investigators will assess the impact of
psilocybin-facilitated treatment on pain, fatigue, and other fibromyalgia symptoms, in
addition to the level of functioning and quality of life. Investigators will also evaluate
potential mediators of treatment (e.g., treatment expectations, pain characteristics,
personality, beliefs/cognitions, emotions). Investigators hypothesize psilocybin treatment
will significantly reduce symptom severity in fibromyalgia patients.