How to treat sprained finger?

Over the summer, I sprained my index finger after a drill at football camp where I landed and my finger bent all the way back. It has never have gotten a chance to heal fully because I'm a wide receiver and use my hands everyday at practice, I just always fight through the pain. Is there anyway I can finally heal my finger/knuckele? Any foods that will boost healing? I have been drinking a lot of protein, too. Any advice would be great, thank you!