Hello and welcome to healthcare magic!!!
Hi renny, Are you a smoker? it could be due to blockage of circulation in the legs. It is termed Thromboangiitis Obliterans
). It could be what is called claudication pain does the pain improve with walking for a distance or does it get worse? Since your job requires you to sit for long durations.
It is better you consult a doctor and get a doppler of the legs done to check for the circulation since you say it is relieved by a massage