I'd say that once a day I get a feeling as if I'm being rabbit punched in the chest. It lasts for maybe 5-10 seconds. It really hurts! Anyway I've been to the doctor (different locum every visit at our surgery!) and they say nothing wrong. I don't drink, given up smoking, avoid coffee (maybe one cup every 2-3 days). Not stressed. It could be Pepsi or coca cola I suppose? Any other thoughts?