I tend to overbreathe when I'm anxious, taking really really deep breaths every few minutes and often breathing from my chest instead of my stomach (I know that's wrong but it's because I also get stomach pain when I'm anxious which makes stomach breathing difficult!). I've been doing it a lot recently and I feel like I've been kicked in the ribs, my whole chest hurts! My sternum, across the top and bottom of my ribs, down to the side and round to the back all feels like one big bruise. Has anyone else had this caused by overbreathing or should I be worried that it's something else?? Thanks!