i've been having stiff neck off and on for 3 and half weeks but with constant neck pain the whole time with pain in right arm, numbness and tingling in my fingers in both hand with part of my right hand numb, i have a week grasp in both hand but worst in my right hand. I also have headaches to follow with the neck pains and pain in my left leg. also with my riht hand i barely can right. i want to now what could be the possible cause?