I too have had this and am experiencing it right now. I actually press my back against the wall to get a deep breath. Have been to the ER twice in the past thinking the worst and they ran all the tests mentioned above and found nothing. I am going to make an appointment tomorrow morning for this. Glad you brought it up Kelly as I was wondering if others experienced it as well. Funny thing is this time around when I lie down in bed I feel relief. In the past I had to prop myself up. Such a strange disease!

Joyce