I have had pain in the calf muscle at the back of my lower right leg , since two weeks now .
Sometimes it radiates up the right side to my hips .
I don't feel it when I am sitting down - only when I get up and stand and walk .
After examining me the Doctor doesn't think it's anything to worry about .
Little more information.
Does the pain come on when you walk and ease off and go at rest?
Is the muscle swollen?
Are you having any medication for any underlying medical problems?
Well Bazile, that is more helpful as the problem seems to be either musculo-skeletal ( old age, wear and tear) or blood vessel blockage problem (as you clearly have a degree of cardiovascular problems) and from 1,000 miles away fro your good self my diagnosis would be the former.
I agree with your doctor that at the moment it is no big deal and probably sciatica from arthritis in you lower spine as hinted by Mamy.
Watch and wait.