About 4 times a week I have a very strong tingling sensation in my upper body. It is so strong it stops me in my tracks. The best way I can describe it is when you squeeze something real tight for a long period of time and then there is a strong tingling sensation. It is in my chest, my back, neck and arms. It last under a minute and then goes away. I have been experiencing them for about two years but in the past few months they have become more intense and instead of 10 seconds it lasts closer to a minute.