You have written about the problem and the solution Sitting for long hours does hamper the blood supply back to the heart and result is pain off and on Intermittent claudication is the resultant disease and a clot forms in the stagnant blood Symptoms are severe pain Solution is exercise Keep moving in between the job Put a support below legs in the form of a foot stool Get feet massaged upward movement Reduce intake of salt Few yoga exercises are meant only for this Do take help from expert Take care before it becomes a problem

Consult  your near  surgeon

Please get a vit D and consult nearest physician

Check your vitamin B12 and vitamin D levels