All day today, I have been having intermittent pain in my left upper chest, just under the collarbone. I am experiencing a brief spasm of pain, lasting no more than 2-3 seconds, then it goes away, only to return in 5-10 minutes. One spasm, then nothing, then another spasm. Stress related? ( it wasn t that stressful of a day) I am not short of breath, dizzy or nauseous. Just worried. Should I go to the ER...I have bad health insurance and an ER visit is going to be expensive. Would love your thoughts and thank you. Sara A.