Hello , as per your description there may be a muscle pull or weakness.please visit your physiotherapist who can have detsiled assessmemt and treat you accordingly. As per your profession being an engineer requires long hours of sitting in front of the computer that too may cause neck shoulder or wrist pain .you may get your ergonomics checked by the physio .he/she can  advise you the type and height of chair to be used.height and distance at which the computer should be placed . Take care