Thank you for the information ,
Beta blockers like metoprolol usually slows heart rate & should relieve your symptom.
Your BP is normal & is not worrying.
You have just tried one dose & it is difficult to say whether it is making it worse or not.
You may consult your Cardiologist before stopping it because sudden cessation of betablocker is not advised.
You should also try to avoid anxiety , caffeine , alcohol & smoking.
Sometimes these may precipitate the attacks
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