Welcome to HCM
We understand your concerns
You mentioned the symptoms but did not mention what caused it. Fight or Flight syndrome might have caused your version of palpitation
and metallic taste
and this syndrome might have been triggered by sudden felt dizziness
and fear arising out of it.
Just walk through all the happenings of that day and you will come across some issue which caused the symptoms.
Instead of worrying about it, try to find a reason and shut it close.