Talk to Neuro Physician on Pain In Leg &arm

1 year back I started having pain in right leg which was initially only in the back of knee and gradually spread to whole leg .the pain starts whenever I sit or stand for too long then it is present for the whole day even when I am sleeping along with this few month back I started having pain in right arm which starts whenever I do alot of writting or do household work &is present for 2 days sometimes.what should I do for it?