Hi dear. I understand your concern. Stress has many symptoms like tachycardia, palpitation, seating, muscle twitching, headache, sleep problem etc. Most them occur in combinations. If you have only one symptoms that jaw muscle pain or twitching then need to rule out other pathology. If it increases while movement then possible of jaw bone pathology. If increase in cold or cold water then it is trigeminal neuralgia. If require then go for x ray and nerve conduction study. Simple analgesic will help to reduce pain like diclofenac or paracetamol. Trigeminal neuralgia can be treated with carbamazapine . Physiotherapy can help. I hope i have answered your query. Still have a query then feel free to ask. Thank you. Take care.