Sharp pain down arm ...?

[Nita]

My mom has been complaining about her arm a lot lately. She says that her shoulder hurts and that the pain shoots down from her shoulder to her arm and her back. She complains that it feels hot. My mom also says that her arm hurts even more at night and that when she sleeps on her opposite arm (the one that doesn't hurt) that the arm that is in pain hurts even more. We've tried to use the heat creams, and pain medication, but it seems like nothing is working. Can someone please give me some advice on some home remedies that she can do. Thanks