The key way to temporarily relieve any hand problems is to target the symptom directly. Sometimes, all you need to do is take a break - move your hands around so that they feel calmer. There is no immediate way to stop shaking hands without burning off adrenaline, but if they're causing you anxiety then your best bet is to get up and move around so that you burn off some of the excess energy and improve blood flow to your extremities.
Those that are hyperventilating need to gain control of their breathing. Slow down your breathing dramatically. Don't worry about expanding your chest or trying to get a deep breath - remember, even though hyperventilation may cause you to feel like you need more air, it's actually a lack of carbon dioxide that leads to hyperventilation. So take slow breaths, hold at the peak, and help your body regain its carbon dioxide levels.
None of these are permanent treatment. If you want to truly treat your anxiety and along with it your related hand symptoms, then you also need to make sure that you learn to manage your anxiety in the long-term.
Summary:
Anxiety is known to affect the hands and fingers, often in different ways. Causes can vary from hyperventilation to adrenaline to muscle tension, but all can be linked back to anxiety. Controlled breathing can help with some of these issues, but the only way to eliminate them is by reducing anxiety.
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