Thanks for all these additional information.
Sorry for late reply and inconvenience.
I understand your concern.
Well as you describe,chances of any serious heart disease in your case as your heart rate is fine.
However at your young age,other possible causes of such symptoms may include Cardiac arrhythmia,thyroid dysfunction,anemia.
You should start a multi-vitamin supplement.
Also hydrate yourself with Gatorade.
Low or fluctuating blood pressure can also result in such symptoms.
Eat a nutritious diet rich in fruits and green leafy vegetables.
I understand your worry about financial situations so you should do deep breathing exercises.
If your heart palpitations 'll not improve then see a doctor or visit ER for EKG as a precautionary measure.
Eat small meals throughout the day.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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Waiting for your response.