Your symptoms are suggestive of a strained vocal cord. The redness and swelling maybe due to the strain and early signs of an impending upper respiratory tract infection. These following steps may help: - Avoid cold food and water, preferably have hot food and water - Don't skip meals have a liquid diet containing soups and progressively increase to solid diet as per how you can tolerate. - Have food rich in vitamin C such as oranges to help build immunity. - Drink plenty of fluids, drink 3 liters of water per day - Do salt water gargling with lukewarm water thrice a day If the condition persists or worsens visit the ENT at earliest

You seem to be suffering from reflux laryngopharyngitis which is type of acidity related disorder. You may need to take anti reflux medications for few days for faster recovery