This stiffness, muscle pain, fasciculations and fatigue all started after getting sick with Covid(all neurological symptoms). I barely had a sniffle when I got sick. Been to neurologist twice. Last time gave me benzodiazepines too. Have no diagnoses, he ruled out MS from brain MRI. I feel SFN fits my symptoms the best. It has progressed. Started with burning in legs and stiffness especially in calves (and felt ++ at night). What helps a bit is heat, hot baths, muscle relaxants and benzodiazepines. I won’t take benzodiazepines though as addictive. On a whack of supplements. Drs have not helped me. I don’t have a final diagnoses.