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Thanks for posting your query.
I am Dr.N and I am pleased to assist you
You are 19 years old. That is too young to get a heart attack. So do not worry about heart attack.
Based on the information provided by you, with history of excess smoking and excess eating and having odd symptoms in the chest and throat, the symptoms could most probably be due to gastroesophageal reflux though you do not have the classic heartburn symptom.
You can take prilosec and look for relief