old injuries act up when fasting. its because they are healing. i had that in my wrist. and there would be days where i felt like someone was driving a screwdriver through it.
soaking in a hot tub and icing it down helped it alot.
you can do hot to cold too by icing it for 15 minutes and then heating pad on it for 15 minutes. do that for about an hour.
when you finish the cleanse you will be AMAZED at how much The Master Cleanser can help you with that. mine barely bothers me at all anymore. before i couldnt even use my hand to do anything more than hold an item that only weighed a few ounces.
even my small tv remote made it hurt to hold it.