Suddenly I am having muscles soreness in a few random spots on my body. It started in the heels of my feet, it isn't my whole foot, just one particular spot by the heel. I haven't bought new shoes or anything recently, or been standing anymore than usual. It is the exact same spot on both feet, and there does not appear to be any bruising or anything. This started about a week ago. A day or so after, my right shoulder started hurting very badly. It feels as if if I pulled a muscle in it or something. I will add that I do not work out (haven't in a few months) so there is no reason my muscles should be sore. Anyways, my shoulder hurts the worst. Again, no bruising and it doesn't appear to be a knot or anything (or at least I can't find it). Now I have neck pain on the same side as the bad shoulder which started a few days ago. It's like it's adding a new spot every day or so. My lower back is now starting to mildly hurt. Am I being paranoid or could there be something wrong? I had some Excedrin Back & Body at my house, so I took some of that which helped for a few hours. My biggest worry is that I haven't done anything that could cause this soreness and it isn't getting better.