Positives

• A long-hauler with POTS, ME, MCAS, and suspected craniocervical instability got an FSM device and it helped them get out of a severe MCAS flare; however, improvements were inconsistent, with some days feeling like gains were reversing overnight Reddit.
  
  

Negatives

• FSM is a complementary therapy, not a primary treatment for any condition, and more research is needed to validate its benefits — sessions are typically not reimbursed by insurance Cleveland Clinic.

Hurdles & Side Effects

• A former runner with 5 years of Long COVID credited FSM along with HRT and integrative manual therapy for completing their first 5K in 5 years, but finding a practitioner was a major hurdle and they had to purchase a device online at significant cost Reddit.