I have unexplained pain, and it lasts in a certain area about 3-4 days, goes away, then I ache in another area. Today it happens to be my hip, the other day it was my foot, before that it was my shoulder,etc. I have noticed that my left ankle is rather swollen, and that is the foot that hurt me earlier. It isn't injured though. All this weirdness is irritiating. Any ideas?