Yes, go to ER. You have a known history of heart disease and any symptoms that might be related to the heart need to be investigated immediately. You might have something entirely unrelated, such as a bone or muscle inflammation, but the heart needs to be checked first. Sometimes stents can block up and that could cause pain in your left arm. You don t necessarily get chest pain at the same time. Women also often experience atypical symptoms with a heart attack or angina. So get it checked at ER now. Hope this helps.