To help relieve pain and discomfort when swallowing due to an ulcer at the back of the mouth near the uvula, there are a few things you can try. Gargling with a mixture of boiled then cooled water with some salt can help. You can also take pain relievers like Tylenol or Advil. Eating cold foods like ice cubes, popsicles, or ice cream may also help soothe the pain. If you have any more questions, feel free to call your local pharmacy for advice.