Hi.... Welcome to healthcare magic... According to your complain you have problem of swelling over face that because of dental abcess. You have history of trauma also present. At night clenching of teeth habits called bruxisum habits. Many factors behind this like stress , occulusal disturbance.. ..etc.. You are taking antibiotics course still symptoms are present so take a IOPA of affected area .If infection or abcess present because of that affect tooth than treatment is must. Tooth infection sometime cause a space infection so it lead to swelling over face. After treating a tooth give a relief. Root canal treatment can done if needed.. After root canal treatment give a crown over it to strengthen a tooth. Consult a dentist for further diagnosis. Detail history and physical examination give exact idea. I hope my guidance helpful to you.. Take care. get well soon. Thank you.