Hello. Thanks for asking from HCM.
I can understand your concern. It is good that your most symptoms have resolved. Now coming to your first symptom, grinding sound on turning head towards right might be due to petrous
bone fracture, muscle spasm of right side neck muscle or cervical
vertebral fracture right side. It can only be confirmed after proper examination and CT head and
cervical spine.
Meanwhile, you can observe for any watery discharge from right ear, decrease in hearing on right side, weakness of limbs, pain on pressing right side of neck. It will help in reaching to some diagnosis. You can take pain killers like
Diclofenac sodium for pain relief after proper prescription.
Prolonged sitting and yawning causing discomfort might be due to post
concussion effect. It will resolve with time. You can simply stop it by avoiding prolonged sitting. Start doing some activities, which will keep you busy. Thats how you will forget about it. You can consult neuropsychiatrist if you still feel stressed. He/she will advise you some anxiolytics and mood elevators to relieve stress.
Thanks. Hope it will help you. Take care.