I must say right away, this is still a "theory". Try to identify the dysfunction of the temporomandibular joint, it helped me. Press your fist on the side of the temporomandibular joint and press sideways, pressing the knuckles on the joint, at the same time with the other hand press the side of the fist on the chin, and open or close your mouth with effort, if you have pain or the joint will reset (there will be clicks in the joint), then you have a dysfunction of the temporomandibular joint, this is the dysfunction or clicks in the joint, or the pain you will need to treat then. Maybe this will help you. Happiness to you, I didn't have enough of it with my stuttering.