Hello, Thank you for your inquiry. Your description indicates symptoms of an infection spreading. You may have a tooth abscesses causing gum irritation or periodontal disease with a pocket of infection. Please try to take anti-inflammatory medication. Try and acetaminophen or an ibuprofen. An antihistamine such as Benadryl can have some positive effects also. Antibiotics by prescription would be best to control the spread of infection. A dental visit with a clinical exam and diagnosis would allow treatment. A root canal or periodontal scaling may be indicated. Warm salt water rinsing may help. Continue to practice good home dental care. You could have inflammation from the start of a respiratory infection. Allergic reactions are possible as well. Any trauma to your gums? Your description being isolated to one side makes me think of an underlying dental problem. Errupting wisdom teeth can cause similar symptoms if an infection occurs. X-rays may indicate a tooth under bone and gums that needs extraction. I hope my suggestions offer relief. I would encourage you to plan a dental visit soon.