If you're resting your forearm or elbow on the desk, you're probably pinching an artery that carries blood to your hand. Since I use a trackball and don't need ot move it, what I do is to move the gel pad back so that my forearm rests on it about an inch from the lump at the end of the bone.
I also have actual, genuine carpal tunnel syndrome, and you should be happt that all you get is a cold hand. In fact, if your hand froze and icicles started forming on your fingers, you'd still be lucky. On some days I have to wrap both arms with ice packs in ACE bandages and take Advil or Asprin* to keep it bearable.
* - Unless I have some of my prescription back pain medication on hand
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