This is a usual problem when u have a TMJ problem. Don t worry. Take a muscle relaxant biz. Meftal Forte or similar (combination of a painkiller and muscle relaxant). Take a towel dipped in warm water and apply on your TMJ both sides as many times as possible in a day. Do warm saline gargles 3-4 times a day. After your pain is slightly relieved, try opening your mouth slowly with the help of your fingers. Try placing two finger first, then three nd so on. Do not open excessively when the muscles are released, otherwise your TMJ will get displaced nd lock jaw problem will come again.and try having a soft diet for at least a week, till your problem is solved. Take care. Don t worry. You ll get we ll soon.