If I'm around family and friends I'm comfortable stuttering infront of I tend to over talk and get fatigued facial muscles after. Sometimes even my throat and neck if I'm really struggling to get words out but usually its more mental fatigue than physical. Constantly worrying about my fluency, wanting to partake in conversatios but knowing I'll stutter sort of stuff, building mental and physical momentum to start talking without prolongs or reps. Mental and physical exhaustion definitely