What Causes Pain In Arms And Shoulder?

doctor perscribed my achey legs as 'lazy legs' about 3 years go, recently they have become worse & now also have the same feeling in my arms & shoulders, like 'growing' pains. the only way i can releive this is by stretching. Seems to be worse when i am sat down at work. I am 47 years old. 5'2, 9st in weight.