Hi! Welcome to Healthcaremagic. I went through your query. Your swollen gum and pain can be due to various reasons like an overextended filling or if the filling was too deep or injury of gum kike toothbrush impingment. I suggest you to get a radiograph done for that tooth to find out exact cause and treat it. However, your other symptoms are unrelated to dental treatment, for which an antibiotic course, adequate rest and cough and cold preparations will be useful. Once you are relived of them and swelling of gum persists, visit your dentist. Do warm saline rinses till then for swelling. Hope the answer helps. Thank you.