This is Dr Frederick Wong. You have suffered from a blunt ear injury, and there may have been pressure transmitted to the middle and inner ear. Therefore, you have the ringing sound and are sensitive to sound.
While you're on track to recovering, it will be better if you have a checkup of your hearing with a formal hearing test and see an ENT specialist for a more thorough examination. Meanwhile, I suggest you avoid playing contact sports, diving, and exposure to loud noise (e.g. going to pop concerts or listening to earphones) until you fully recover.