 This randomized-controlled pilot study uses a wait-list control design. A wait-list design includes a control group that is assigned to a waiting list to receive an intervention after the active treatment group does. In this study, the active group will receive the psilocybin at weeks 5 and 9 and the wait-list control group will receive psilocybin at weeks 30 and 34. The wait-list control group serves the purpose of providing an untreated comparison for the active treatment group, while at the same time allowing the wait-list participants an opportunity to obtain the intervention at a later date. 