@noteworthy It would help if you could give us a bit of history of how this happened for the loss of strength in your arm and hand. If that was sudden, then it may be an urgent situation as others have suggested. If this is something that happened gradually or after and accident or injury, it may be a physical problem that needs diagnosis of if it is a possible neurological or muscular problem or a circulatory or inflammatory problem, and a neurologist may be a good choice for a first consultation. Since you have a referral to Mayo, it sounds like you have already discussed this with your doctor.. correct?

The answer to your question of what can be done to help depends entirely of what the problem is. Are you waiting for an answer if you can get an appointment at Mayo?