For the past 2 weeks or so I have been waking up with a really sore arm on my right side from the shoulder to elbow. I have always slept on my right side and never had a problem like this before. I have tried to sleep in different positions but it doesn’t seem to be helping. I have been up for about an hour and it is still sore. I’m really fed up with it and need to figure out what to do. Any ideas?