Some advice may look very simple but it helps:
Get a flush and fish your teeth very well, it will take off the some plaque away. Have a glass of warm water add salt and 5 -10 drops hydogen peroxide (do not put too much hydrogen peroxide it will scrub your gum and mouth wall) If it is hurting too much you can use orazole or orasole over the counter medicine. You will see the difference within couple days.