I injured my right foot in a slip and fall on Sept. 20, 2013. It's painful to walk, I have some degree (4-8) of pain constantly and my foot feels real cold all of the time. I have started feeling similar symptoms in my left foot. Is it my imagination or can RSD spread that quickly? I force myself to walk but do find that I prefer laying or sitting because both feet hurt when I walk. Finding a comfortable shoe has also been a real challenge.