For the past 3 days I have been experiencing a pulsating feeling in my upper right thigh/lower right buttox. I have never experienced this before and it is really starting to annoy me. I have noticed that it does stop and start. When I walk I don't feel it but, when I sit down or lay down I can feel it. It will pound for a while then it stops only to start up again. There is no pain just the constant pulsating feeling. Should I be worried?