Welcome to healthcare magic for your health concerns I am Dr Fahim and I will be looking into your problem I have gone through your question and understood your problem and concerns. It appears to inflammation of the submandibular gland with differentials of submandibular lymph node enlargement. These group of lymph nodes drain lymphatics of the oral cavity and oropharynx. For such a swollen and painful lymph nodes infection must be evident. If such a patient walk into my clinic I will approach him as a case of submandibular gland inflammation and treat him with oral antibiotics (which you are already taking), analgesics like tab paracetamol, maintain good hydration, warm compresses and massage. If does not respond to this treatment then it needs surgical intervention; incision and drainage if abscess formed, gland/lymph nodes excision and sending it to histopathology examination to get a definitive diagnosis. You need to see a general surgeon, who after clinical examination will guide you about the management plan. I hope my answer will help you. Do rate it if you like it. Regards