I've had chest pains my entire life, usually breathing-related. Since going Primal almost 4 years ago, the sharper pains have disappeared, but I still get a dull ache from running, etc. Stress alone (upcoming tests?) can do it, as can singing too loud for too long.
A woman's husband had arterial plaque, went paleo and was eating an avocado a day or more, and a year later all the plaque was gone. The foods you list are not the problem. Are you eating bagels at school or have you ever had asthma?