What Causes Weakness In Fingers, Soreness And Numbness Near Knuckles?

Hi! I have weakened little finger and ring finger in my right hand. My ring finger knuckle has sunk down. There is a constant sore spasm/cramp in the palm muscle below the little finger. Sometimes my elbow and shoulder ache a bit. What do you think about what is happening in the hand? Thankyou for your time...