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Thanks for this question.
I'm very sorry about this.
It could be a heart arrhythmia
At your age, heart arrhythmias are very common and often present like this.
I would do the following
1)See your doctor and tell the history
2)ask for a blood count, thyroid and overall physical check
3)get a holter monitor. This is the most important. It is a 24 hour heart monitor you wear at home
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