Fell hit head and is now dizzy and hearing things need help?

About a week or so ago, my grandmother, 86 years old, fell off of a chair while trying to turn off a smoke detector, hitting the back of her head on the floor pretty hard. A few days later, while she was trying to sleep, she suddenly experienced severe dizziness and started hearing banging noises that only she could hear. She spent the entire night trying to fall asleep but she couldn't due to the loud noises. The next day we brought her to the hospital, where she stayed for two days. All they did was give her a blood test and then let her go. Now she continues to be dizzy and she is still hearing things. I don't know if it has anything to do with this, but a few months ago she couldn't sleep because she could hear music that no one else could hear. I gave her some ear drops and the singing stopped. I've looked everywhere but I haven't found anything at all that would help. This is really bad because she is going to be evaluated to see if she can renew her drivers license, and her high blood pressure may not allow her to get her license again, and this isn't helping her at all.