As per the information provided by you it is creating a work related stress on your shoulder muscles or trapezium muscles as we call it which happens with most of the IT workers or students today due to constant work on laptop and incorrect posture.It is not a one day phenomenon but happens gradually.
Next Steps
Start doing stretching for cervical muscles.
shoulder rounds clockwise and anticlockwise.
shoulder shrugging.
Health Tips
heating .
avoid long sitting and learn correct posture.