I normally feel fine, but, for the past 4 weeks, after a short time using the mouse on my computer, my right tricep is in severe pain and then my upper right back and shoulder get the pain, as well....... Eventually, I have to stop using the computer due to the severity of the pain..... I use a TENS device to temporarily alleviate the pain and make it go away while I sleep...... Any suggestions, besides becoming a left handed mouse user??????