I Have Been Studying Heart Problems And Anxiety issues for a year and a half!!
Heart Pain Stays in the same place doesnt hurt when you touch it or move or breath!
At your age i would think it was very unlikely that you had a heart problem though i have anxiety jaw chest and arm pains and dizziness and im sixteen !
If you keep convincing yourself its your heart you will become worse and will grow more syphtoms "" Just calm down ! and have a check up at the doctors and see a physiciartrist !!
Smoking will make your anxietys worse like mine did i gave it up genuinely believe if it scared you that much you wouldnt smoke !
these r things you should avoid with anxiety
Nicottine
Fatty foods
Caffine/Coca cola
Hpe this helped wb