What can I do for Numbness in hand after shoulder surgery?

[Artfulruth]

69 y.o. Woman, active gardener and housewife. Two weeks ago i had reverse shoulder replacement, left side, with nerve block. At first my thumb and forefinger were numb but that passed off and then the outside of left hand and pinky and ring finger became excruciatingly sensitive and numb, with sensitivity up the outer forearm, outer elbow, inner upper arm. The shoulder is healing just fine, hardly any pain, but the hand is killing me. I have a hard time finding a position that allows me to fall asleep. And moving the hand is painful, can't write or eat or do my artwork. All the professionals say give it tie, it takes times, the arm was vigorously"manipulated" (i.e. Tortured) in surgery. PT helps with message but that is only temporary. Can't do the exercises for the shoulder too well because the hand and arm hurt. Isn't there any drug that would perhaps relax the muscles in the shoulder and arm because I am very tense and the PT noted how tight my muscles were.