I've dealt with anxiety for some time. Usually I keep it under control. However, when it gets bad I get an extremely uncomfortable tight and tingling feeling under my sternum.  It often is the result of going several nights without much sleep.  As a result of the feeling, I often feel it hard to get much sleep the next night, staring a vicious cycle.  I've tried deep breathing, and while it does help, it doesn't get rid of it altogether. Does anyone else get this symptom? How do you deal with it?