I cannot bend my wrist forward or backwards due to a severe amount of pain. I can move it sideways (imagine waving with just your hand from left to right) with less pain. It feels stiff and sore when I don't move it. There is no swelling and no bruising. Compared to my other wrist, the underside feels almost 'mushy', compared to the tight feeling of muscles/tendons in my other wrist. What's wrong? I did nothing to injure it, it just started hurting!