I used to have that problem. I had an old, very good, archer tell me to take a deep hook, make sure I had equal pressure across all my fingers on the string during my shot sequence and squeeze it so hard as if to try and cut it in two. Numb fingers, calluses, and discomfort of any kind went away.
He also said if you make a conscious effort to keep equal pressure across the string during the draw, you elbow will automatically be at the proper height at anchor.