Hi. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain and presentation of symptoms it seems that you are suffering from ACUTE ANTERIOR DISLOCATION OF ARTICULAR DISC which has occurred following injury leading to clicking sound from the joint as the two ends bony ends of the jaw joint must be coming directly in contact with each other as the soft cushion between them that is the articular disc is dislocated.. The pain and stiffness is also due to inflammation and injury to the soft tissues and muscles over the side of face that is traumatized along with the jaw joint injury.. As during morning there has been a long gap for which the muscles have been in an inactive stage there is more of stiffness and as the movement begins like for chewing , speaking etc the stiffness reduces.. You should consult an Oral Physician and get evaluated and a few radiological investigations like Full mouth x-ray [Orthopantomogram], MRI SCANNING, ARTHROGRAPHY can help in diagnosing the exact condition of the jaw and the jaw joint and treatment can be planned accordingly.. As far as diagnosing from your question is concerned it seems to be dislocated articular disk and if it comes to be final diagnosis then Physiotheraphy [home based exercise plan] for two months and Electro-therapy that is using electrodes to diffuse the drugs in the area of jaw joint known as IONIC CHEMOTHERAPY can be helpful in relieving the patient.. For fractures in the bone closed reduction or surgery can be done depending upon the condition of the jaw.. Hope this information helps.. If you find the answer helpful please give me a Five Star Review and click on found the answer helpful as a token of appreciation.. Thanks and regards.. Dr.Honey Nandwani Arora..