This is because of your wrong posture during work and travelling. The muscles becomes weak, stiff and painful with time. You should consult a physiotherapist.
Next Steps
Go to a physiotherapist.. Ultrasonic therapy+IFT +Heating therapy +exercises(stretching as well as strengthening) will be helpful.
Health Tips
At home..Rest +hot water fomentation +pain killer gel +no long sitting +no forward bending +no weight lifting +avoid cold exposure +no manual exertions +no long travelling +no stair climbing +correct posture(sit tall).