You might look into the body/neck position/ posture factors.
You tube has a great mix of posture videos and how to correct if you might have "forward head & neck" or "rounded & hunched shoulders".
Those postures can close down on the areas that the blood & nerves run thru.
https://www.neurotalk.org/members/100-albums422.html
You don't want the military rigid posture but a natural aligned posture..