What else can cause very mild arm pain mild chest pain and nausea besides a heart attack? I've had discomfort all day but don't want to overreact...

Get checked out. The symptoms you describe could certainly be explained by a heart attack. Not everyone has the "classic" symptoms of crushing chest pain when they have a heart attack. There are certainly other possibilities, but since it is unclear the safest thing to do would be to get evaluated by a physician as soon as possible.

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