[Concern] My gums swelled up, but now the swelling has gone down.

Because of sensitive teeth, I have difficulty eating cold drinks or sour fruits. There is also pain when brushing, but recently one side of my gums swelled up, making it hard to eat. After a few days, the swelling subsided, but it seems like an infection has developed. I'm afraid of going to the dentist, so I keep delaying it. Is there any way to treat this with home remedies?