hello',
u r not clear in ur history & symptoms. anyway since u say the area of pain varies everytime it may be a problem of artery i.e 1.intermitent claudication,
2.arteritis.
go check with ur physio again.if it is not a musculoskeletal problem,then consider my above sayings consult with a vascularsurgeon.
first diagnose the problem then its easy to cure it.do reply.