i have "pain" type dreams too. sometimes the pain is real, sometimes it's not.
what *else* happens in the dream? how are feeling (in the dream) and how do you feel when you wake?
i believe dreams are messages from us, to us (so-to-speak). you know, subconscious things brought forward to the conscious mind (even though you're sleeping, you wake with awareness of the dream).
maybe it's a message (or confirmation) of how illness affects and/or limits your life? (can't get far with a hurt foot) without any other part of the dream, it's hard to analyze this one.
also, some dreams seem impossible to interpret (and maybe they *are*!).
anyway, if you can, try to remember what *else* is happening in the dream, how you're feeling as it happens and how you feel when you wake. recurrent (sp?) dreams often have great meaning to me.
good luck! lemme know if i can help with further details.
happy friday to ya,