I’m currently experiencing irregular heartbeat, fatigue, dizziness-some slightly blurring of vision, please advise?

I’m 21/ F. Currently experiencing irregular heartbeat, fatigue, dizziness–some slightly blurring of vision.
Sometimes nauseous – which is made worse in the mornings (I once threw up one morning, not too long ago).
I am also feeling as though I have lost some weight – and am worried about this current condition. – was wondering what it could be?

Thank you, (…)

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